diff --git a/examples/misc/deploy.sh b/examples/misc/deploy.sh
index ac928dc8..586eec9e 100644
--- a/examples/misc/deploy.sh
+++ b/examples/misc/deploy.sh
@@ -6,9 +6,11 @@ set -x
 
 fission env create --name binary --image fission/binary-env
 fission fn create --name dump --env binary --deploy ./dump.sh
+fission fn create --name multinsdump --fns fission-function --env binary --deploy ./dump.sh
 
 # Deploy workflows
 fission fn create --name inputs --env workflow --src ./inputs.wf.yaml
 fission fn create --name fibonacci --env workflow --src ./fibonacci.wf.yaml
 fission fn create --name sleepalot --env workflow --src ./sleepalot.wf.yaml
-fission fn create --name fission-inputs --env workflow --src ./fission-inputs.wf.yaml
\ No newline at end of file
+fission fn create --name fission-inputs --env workflow --src ./fission-inputs.wf.yaml
+fission fn create --name multinamespace --fns fission-function --env workflow --src ./multinamespace.wf.yaml
diff --git a/examples/misc/multinamespace.wf.yaml b/examples/misc/multinamespace.wf.yaml
new file mode 100644
index 00000000..0a50a201
--- /dev/null
+++ b/examples/misc/multinamespace.wf.yaml
@@ -0,0 +1,10 @@
+# multinamespace shows you how to access and refere a fission function in task under specific namespace.
+#
+# Usage example: fission fn test --name multinamespace --fns fission-function -b 'Hello World'
+apiVersion: 1
+output: multinamespace
+
+tasks:
+  multinamespace:
+    run: fission://fission-function/multinsdump
+    inputs: "{ $.Invocation.Inputs }"
diff --git a/pkg/fnenv/fission/resolver.go b/pkg/fnenv/fission/resolver.go
index bb214617..0d382f89 100644
--- a/pkg/fnenv/fission/resolver.go
+++ b/pkg/fnenv/fission/resolver.go
@@ -1,6 +1,7 @@
 package fission
 
 import (
+	"github.com/fission/fission-workflows/pkg/types"
 	"github.com/fission/fission/controller/client"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
@@ -15,18 +16,18 @@ func NewResolver(controller *client.Client) *Resolver {
 	return &Resolver{controller}
 }
 
-func (re *Resolver) Resolve(fnName string) (string, error) {
+func (re *Resolver) Resolve(ref types.FnRef) (string, error) {
 	// Currently we just use the controller API to check if the function exists.
-	log.Infof("Resolving function: %s", fnName)
+	log.Infof("Resolving function: %s", ref.ID)
 	_, err := re.controller.FunctionGet(&metav1.ObjectMeta{
-		Name:      fnName,
-		Namespace: metav1.NamespaceDefault,
+		Name:      ref.ID,
+		Namespace: ref.Namespace,
 	})
 	if err != nil {
 		return "", err
 	}
-	id := fnName
+	id := ref.ID
 
-	log.Infof("Resolved fission function %s to %s", fnName, id)
+	log.Infof("Resolved fission function %s to %s", ref.ID, id)
 	return id, nil
 }
diff --git a/pkg/fnenv/fission/runtime.go b/pkg/fnenv/fission/runtime.go
index de5cb5b1..e8e532ac 100644
--- a/pkg/fnenv/fission/runtime.go
+++ b/pkg/fnenv/fission/runtime.go
@@ -156,5 +156,9 @@ func createFunctionMeta(fn types.FnRef) *metav1.ObjectMeta {
 }
 
 func (fe *FunctionEnv) createRouterURL(fn types.FnRef) string {
-	return fe.routerURL + "/fission-function/" + fn.ID
+	if fn.Namespace == metav1.NamespaceDefault {
+		return fe.routerURL + "/fission-function/" + fn.ID
+	}
+
+	return fe.routerURL + "/fission-function/" + fn.Namespace + "/" + fn.ID
 }
diff --git a/pkg/fnenv/fnenv.go b/pkg/fnenv/fnenv.go
index 3cde806b..05141d26 100644
--- a/pkg/fnenv/fnenv.go
+++ b/pkg/fnenv/fnenv.go
@@ -105,5 +105,5 @@ type RuntimeResolver interface {
 
 	// ResolveTask resolved an ambiguous target function name to a unique identifier of a function within the scope
 	// of a runtime.
-	Resolve(targetFn string) (string, error)
+	Resolve(ref types.FnRef) (string, error)
 }
diff --git a/pkg/fnenv/mock/mock.go b/pkg/fnenv/mock/mock.go
index 18707e4f..2a2cc786 100644
--- a/pkg/fnenv/mock/mock.go
+++ b/pkg/fnenv/mock/mock.go
@@ -145,10 +145,10 @@ type Resolver struct {
 	FnNameIDs map[string]string
 }
 
-func (mf *Resolver) Resolve(fnName string) (string, error) {
-	fnID, ok := mf.FnNameIDs[fnName]
+func (mf *Resolver) Resolve(ref types.FnRef) (string, error) {
+	fnID, ok := mf.FnNameIDs[ref.ID]
 	if !ok {
-		return "", fmt.Errorf("could not resolve function '%s' using resolve-map '%v'", fnName, mf.FnNameIDs)
+		return "", fmt.Errorf("could not resolve function '%s' using resolve-map '%v'", ref.ID, mf.FnNameIDs)
 	}
 
 	return fnID, nil
diff --git a/pkg/fnenv/native/native.go b/pkg/fnenv/native/native.go
index aed4d962..cf73f497 100644
--- a/pkg/fnenv/native/native.go
+++ b/pkg/fnenv/native/native.go
@@ -83,13 +83,13 @@ func (fe *FunctionEnv) Invoke(spec *types.TaskInvocationSpec) (*types.TaskInvoca
 	}, nil
 }
 
-func (fe *FunctionEnv) Resolve(fnName string) (string, error) {
-	_, ok := fe.fns[fnName]
+func (fe *FunctionEnv) Resolve(ref types.FnRef) (string, error) {
+	_, ok := fe.fns[ref.ID]
 	if !ok {
-		return "", fmt.Errorf("could not resolve internal function '%s'", fnName)
+		return "", fmt.Errorf("could not resolve internal function '%s'", ref.ID)
 	}
-	log.WithField("name", fnName).WithField("uid", fnName).Debug("Resolved internal function")
-	return fnName, nil
+	log.WithField("name", ref.ID).WithField("uid", ref.ID).Debug("Resolved internal function")
+	return ref.ID, nil
 }
 
 func (fe *FunctionEnv) RegisterFn(name string, fn InternalFunction) {
diff --git a/pkg/fnenv/resolver.go b/pkg/fnenv/resolver.go
index 82d73856..801ae11c 100644
--- a/pkg/fnenv/resolver.go
+++ b/pkg/fnenv/resolver.go
@@ -52,17 +52,11 @@ func NewMetaResolver(client map[string]RuntimeResolver) *MetaResolver {
 func (ps *MetaResolver) Resolve(targetFn string) (types.FnRef, error) {
 	ref, err := types.ParseFnRef(targetFn)
 	if err != nil {
-		if err == types.ErrNoRuntime {
-			ref = types.FnRef{
-				ID: targetFn,
-			}
-		} else {
-			return types.FnRef{}, err
-		}
+		return types.FnRef{}, err
 	}
 
 	if ref.Runtime != "" {
-		return ps.resolveForRuntime(ref.ID, ref.Runtime)
+		return ps.resolveForRuntime(ref)
 	}
 
 	waitFor := len(ps.clients)
@@ -73,7 +67,7 @@ func (ps *MetaResolver) Resolve(targetFn string) (types.FnRef, error) {
 	var lastErr error
 	for cName := range ps.clients {
 		go func(cName string) {
-			def, err := ps.resolveForRuntime(ref.ID, cName)
+			def, err := ps.resolveForRuntime(types.FnRef{Runtime: cName, Namespace: ref.Namespace, ID: ref.ID})
 			if err != nil {
 				logrus.WithFields(logrus.Fields{
 					"err":     err,
@@ -99,20 +93,21 @@ func (ps *MetaResolver) Resolve(targetFn string) (types.FnRef, error) {
 	}
 }
 
-func (ps *MetaResolver) resolveForRuntime(targetFn string, runtime string) (types.FnRef, error) {
-	dst, ok := ps.clients[runtime]
+func (ps *MetaResolver) resolveForRuntime(ref types.FnRef) (types.FnRef, error) {
+	dst, ok := ps.clients[ref.Runtime]
 	if !ok {
 		return types.FnRef{}, ErrInvalidRuntime
 	}
-	rsv, err := dst.Resolve(targetFn)
+	rsv, err := dst.Resolve(ref)
 	if err != nil {
 		return types.FnRef{}, err
 	}
 
-	fnResolved.WithLabelValues(runtime).Inc()
+	fnResolved.WithLabelValues(ref.Runtime).Inc()
 	return types.FnRef{
-		Runtime: runtime,
-		ID:      rsv,
+		Runtime:   ref.Runtime,
+		Namespace: ref.Namespace,
+		ID:        rsv,
 	}, nil
 }
 
@@ -182,10 +177,12 @@ func resolveTask(ps Resolver, id string, task *types.TaskSpec, resolvedC chan so
 	if task == nil || resolvedC == nil {
 		return nil
 	}
+
 	t, err := ps.Resolve(task.FunctionRef)
 	if err != nil {
 		return err
 	}
+
 	resolvedC <- sourceFnRef{
 		src:   id,
 		FnRef: &t,
diff --git a/pkg/fnenv/resolver_test.go b/pkg/fnenv/resolver_test.go
index a4dfff93..271f5dc2 100644
--- a/pkg/fnenv/resolver_test.go
+++ b/pkg/fnenv/resolver_test.go
@@ -47,7 +47,7 @@ func TestResolveForced(t *testing.T) {
 	resolver := NewMetaResolver(clients)
 
 	task1 := "task1"
-	task1Ref := types.NewFnRef(fooClient, "lowercase")
+	task1Ref := types.NewFnRef(fooClient, "", "lowercase")
 	task1Name := task1Ref.Format()
 	tasks := map[string]*types.TaskSpec{
 		task1: {
@@ -133,6 +133,6 @@ type MockedFunctionResolver struct {
 	Fn func(string) (string, error)
 }
 
-func (mk *MockedFunctionResolver) Resolve(fnName string) (string, error) {
-	return mk.Fn(fnName)
+func (mk *MockedFunctionResolver) Resolve(ref types.FnRef) (string, error) {
+	return mk.Fn(ref.ID)
 }
diff --git a/pkg/fnenv/workflows/workflows_test.go b/pkg/fnenv/workflows/workflows_test.go
index c1e731a5..09c77fc4 100644
--- a/pkg/fnenv/workflows/workflows_test.go
+++ b/pkg/fnenv/workflows/workflows_test.go
@@ -131,7 +131,7 @@ func TestRuntime_InvokeWorkflow_Cancel(t *testing.T) {
 func TestRuntime_Invoke(t *testing.T) {
 	runtime, invocationAPI, _, cache := setup()
 
-	spec := types.NewTaskInvocationSpec("wi-123", "ti-123", types.NewFnRef("internal", "fooFn"))
+	spec := types.NewTaskInvocationSpec("wi-123", "ti-123", types.NewFnRef("internal", "", "fooFn"))
 	spec.Inputs = types.Inputs{}
 	spec.Inputs[types.InputParent] = typedvalues.MustParse("parentID")
 	output := typedvalues.MustParse("foo")
diff --git a/pkg/types/fnref.go b/pkg/types/fnref.go
index 5dd955ac..324b5f4c 100644
--- a/pkg/types/fnref.go
+++ b/pkg/types/fnref.go
@@ -4,16 +4,24 @@ import (
 	"errors"
 	"fmt"
 	"regexp"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
 const (
 	RuntimeDelimiter = "://"
-	groupRuntime     = 1
-	groupRuntimeID   = 2
+)
+
+const (
+	// These are the index of capture groups for the FnRef regex
+	groupFnRef = iota
+	groupRuntime
+	groupNamespace
+	groupRuntimeID
 )
 
 var (
-	fnRefReg        = regexp.MustCompile(fmt.Sprintf("^(?:(\\w+)%s)?(\\w+)$", RuntimeDelimiter))
+	fnRefReg        = regexp.MustCompile(fmt.Sprintf("^(?:(\\w+)%s)?(?:([a-zA-Z0-9][a-zA-Z0-9_-]{1,128})/)?(\\w+)$", RuntimeDelimiter))
 	ErrInvalidFnRef = errors.New("invalid function reference")
 	ErrNoRuntime    = errors.New("function reference does not contain a runtime")
 	ErrNoRuntimeID  = errors.New("function reference does not contain a runtimeId")
@@ -25,6 +33,11 @@ func (m FnRef) Format() string {
 		runtime = m.Runtime + RuntimeDelimiter
 	}
 
+	if len(m.Namespace) > 0 {
+		return runtime + m.Namespace + `/` + m.ID
+
+	}
+
 	return runtime + m.ID
 }
 
@@ -41,13 +54,14 @@ func IsFnRef(s string) bool {
 	return err == nil
 }
 
-func NewFnRef(runtime string, id string) FnRef {
+func NewFnRef(runtime, ns, id string) FnRef {
 	if len(id) == 0 {
 		panic("function reference needs a runtime id")
 	}
 	return FnRef{
-		Runtime: runtime,
-		ID:      id,
+		Runtime:   runtime,
+		Namespace: ns,
+		ID:        id,
 	}
 }
 
@@ -57,20 +71,14 @@ func ParseFnRef(s string) (FnRef, error) {
 		return FnRef{}, ErrInvalidFnRef
 	}
 
-	if len(matches[groupRuntimeID]) == 0 {
-		return FnRef{
-			Runtime: matches[groupRuntime],
-		}, ErrNoRuntimeID
-	}
-
-	if len(matches[groupRuntime]) == 0 {
-		return FnRef{
-			ID: matches[groupRuntimeID],
-		}, ErrNoRuntime
+	ns := matches[groupNamespace]
+	if len(ns) == 0 {
+		ns = metav1.NamespaceDefault
 	}
 
 	return FnRef{
-		Runtime: matches[groupRuntime],
-		ID:      matches[groupRuntimeID],
+		Runtime:   matches[groupRuntime],
+		Namespace: ns,
+		ID:        matches[groupRuntimeID],
 	}, nil
 }
diff --git a/pkg/types/fnref_test.go b/pkg/types/fnref_test.go
index c2e15182..74852d60 100644
--- a/pkg/types/fnref_test.go
+++ b/pkg/types/fnref_test.go
@@ -8,15 +8,18 @@ import (
 
 var parseCases = map[string]struct {
 	FnRef
-	err error
+	err  error
+	full string
 }{
-	"":              {FnRef{}, ErrInvalidFnRef},
-	"noRuntime":     {NewFnRef("", "noRuntime"), ErrNoRuntime},
-	"://":           {FnRef{}, ErrInvalidFnRef},
-	"://runtimeId":  {FnRef{}, ErrInvalidFnRef},
-	"runtime://":    {FnRef{}, ErrInvalidFnRef},
-	"a://b":         {NewFnRef("a", "b"), nil},
-	"http://foobar": {NewFnRef("http", "foobar"), nil},
+	"noRuntime":                         {NewFnRef("", "default", "noRuntime"), nil, "default/noRuntime"},
+	"a://b":                             {NewFnRef("a", "default", "b"), nil, "a://default/b"},
+	"http://foobar":                     {NewFnRef("http", "default", "foobar"), nil, "http://default/foobar"},
+	"fission://fission-function/foobar": {NewFnRef("fission", "fission-function", "foobar"), nil, "fission://fission-function/foobar"},
+
+	"":             {FnRef{}, ErrInvalidFnRef, ""},
+	"://":          {FnRef{}, ErrInvalidFnRef, ""},
+	"://runtimeId": {FnRef{}, ErrInvalidFnRef, ""},
+	"runtime://":   {FnRef{}, ErrInvalidFnRef, ""},
 }
 
 func TestParse(t *testing.T) {
@@ -36,7 +39,7 @@ func TestFnRef_Format(t *testing.T) {
 		t.Run(expected, func(t *testing.T) {
 			fnRef := input.FnRef
 			if !fnRef.IsEmpty() {
-				assert.Equal(t, expected, fnRef.Format())
+				assert.Equal(t, input.full, fnRef.Format())
 			}
 		})
 	}
diff --git a/pkg/types/types.pb.go b/pkg/types/types.pb.go
index ccfeed24..d1c6ab5e 100644
--- a/pkg/types/types.pb.go
+++ b/pkg/types/types.pb.go
@@ -867,8 +867,10 @@ func (m *Error) GetMessage() string {
 type FnRef struct {
 	// Runtime is the Function Runtime environment (fnenv) that was used to resolve the function.
 	Runtime string `protobuf:"bytes,2,opt,name=runtime" json:"runtime,omitempty"`
+	// Namespace is the namespace of the fission function.
+	Namespace string `protobuf:"bytes,3,opt,name=namespace" json:"namespace,omitempty"`
 	// ID is the runtime-specific identifier of the function.
-	ID string `protobuf:"bytes,3,opt,name=ID" json:"ID,omitempty"`
+	ID string `protobuf:"bytes,4,opt,name=ID" json:"ID,omitempty"`
 }
 
 func (m *FnRef) Reset()                    { *m = FnRef{} }
@@ -883,6 +885,13 @@ func (m *FnRef) GetRuntime() string {
 	return ""
 }
 
+func (m *FnRef) GetNamespace() string {
+	if m != nil {
+		return m.Namespace
+	}
+	return ""
+}
+
 func (m *FnRef) GetID() string {
 	if m != nil {
 		return m.ID
@@ -955,91 +964,92 @@ func init() {
 func init() { proto.RegisterFile("pkg/types/types.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1368 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xbc, 0x57, 0x41, 0x73, 0xdb, 0x44,
-	0x14, 0xae, 0x64, 0xcb, 0xb1, 0x9f, 0x53, 0x63, 0x76, 0x4a, 0xf1, 0x78, 0x86, 0x92, 0x8a, 0x61,
-	0xda, 0x01, 0xaa, 0x90, 0xb4, 0x4c, 0x1b, 0x02, 0x53, 0x5c, 0x4b, 0x49, 0x35, 0x49, 0x6c, 0x8f,
-	0xec, 0xb4, 0xd3, 0x32, 0x6d, 0x47, 0xb1, 0xd6, 0x19, 0x35, 0xb6, 0x2c, 0x24, 0xb9, 0x9d, 0xfc,
-	0x04, 0xfe, 0x07, 0x47, 0xee, 0x9d, 0xe1, 0xc2, 0x81, 0x23, 0xbf, 0x81, 0xe1, 0xc0, 0x89, 0x03,
-	0x77, 0x2e, 0xcc, 0x30, 0xbb, 0x5a, 0x59, 0x2b, 0xc7, 0x8e, 0xe5, 0xe2, 0x70, 0x49, 0xb4, 0xbb,
-	0xef, 0xbd, 0x7d, 0xfb, 0xbd, 0xef, 0x7d, 0xbb, 0x86, 0xf7, 0xdc, 0x93, 0xe3, 0xf5, 0xe0, 0xd4,
-	0xc5, 0x7e, 0xf8, 0x57, 0x71, 0xbd, 0x61, 0x30, 0x44, 0xef, 0xf7, 0x6c, 0xdf, 0xb7, 0x87, 0x8e,
-	0xf2, 0x7a, 0xe8, 0x9d, 0xf4, 0xfa, 0xc3, 0xd7, 0xbe, 0x42, 0x97, 0xab, 0x1f, 0x1e, 0x0f, 0x87,
-	0xc7, 0x7d, 0xbc, 0x4e, 0xcd, 0x8e, 0x46, 0xbd, 0xf5, 0xc0, 0x1e, 0x60, 0x3f, 0x30, 0x07, 0x6e,
-	0xe8, 0x29, 0xff, 0x2a, 0x40, 0xfe, 0x31, 0x73, 0x42, 0x75, 0xc8, 0x0f, 0x70, 0x60, 0x5a, 0x66,
-	0x60, 0x56, 0x84, 0x35, 0xe1, 0x66, 0x71, 0xf3, 0x86, 0x32, 0x23, 0xb2, 0xd2, 0x3c, 0x7a, 0x89,
-	0xbb, 0xc1, 0x01, 0x33, 0x37, 0xc6, 0x8e, 0x68, 0x0b, 0xb2, 0xbe, 0x8b, 0xbb, 0x15, 0x91, 0x06,
-	0xf8, 0x78, 0x66, 0x80, 0x68, 0xd7, 0xb6, 0x8b, 0xbb, 0x06, 0x75, 0x41, 0xf7, 0x21, 0xe7, 0x07,
-	0x66, 0x30, 0xf2, 0x2b, 0x99, 0x39, 0xbb, 0x8f, 0x9d, 0xa9, 0xb9, 0xc1, 0xdc, 0xe4, 0xdf, 0x45,
-	0x58, 0xe5, 0xe3, 0xa2, 0x6b, 0x00, 0xa6, 0x6b, 0x3f, 0xc2, 0x1e, 0x89, 0x42, 0xcf, 0x54, 0x30,
-	0xb8, 0x19, 0xb4, 0x03, 0x52, 0x60, 0xfa, 0x27, 0x7e, 0x45, 0x5c, 0xcb, 0xdc, 0x2c, 0x6e, 0x7e,
-	0x9e, 0x2a, 0x5b, 0xa5, 0x43, 0x5c, 0x34, 0x27, 0xf0, 0x4e, 0x8d, 0xd0, 0x9d, 0xec, 0x33, 0x1c,
-	0x05, 0xee, 0x28, 0x20, 0x4b, 0x34, 0xfb, 0x82, 0xc1, 0xcd, 0xa0, 0x35, 0x28, 0x5a, 0xd8, 0xef,
-	0x7a, 0xb6, 0x1b, 0x90, 0x44, 0xb2, 0xd4, 0x80, 0x9f, 0x42, 0x15, 0x58, 0xe9, 0x0d, 0xbd, 0x2e,
-	0xd6, 0xad, 0x8a, 0x44, 0x57, 0xa3, 0x21, 0x42, 0x90, 0x75, 0xcc, 0x01, 0xae, 0xe4, 0xe8, 0x34,
-	0xfd, 0x46, 0x55, 0xc8, 0xdb, 0x4e, 0x80, 0x3d, 0xc7, 0xec, 0x57, 0x56, 0xd6, 0x84, 0x9b, 0x79,
-	0x63, 0x3c, 0xae, 0x7e, 0x0b, 0x10, 0x27, 0x88, 0xca, 0x90, 0x39, 0xc1, 0xa7, 0xec, 0xe8, 0xe4,
-	0x13, 0xdd, 0x05, 0xe9, 0x95, 0xd9, 0x1f, 0x61, 0x56, 0xa1, 0xeb, 0x33, 0xcf, 0x4c, 0xa2, 0xd0,
-	0xea, 0x84, 0xf6, 0x5f, 0x8a, 0xf7, 0x04, 0xf9, 0xc7, 0x0c, 0x94, 0x92, 0xe0, 0xa3, 0x9d, 0x71,
-	0xd5, 0xc8, 0x26, 0xa5, 0x4d, 0x25, 0x65, 0xd5, 0x94, 0x64, 0xf1, 0xd0, 0x3d, 0x28, 0x8c, 0x5c,
-	0xcb, 0x0c, 0xb0, 0x55, 0x0b, 0x58, 0x6e, 0x55, 0x25, 0xe4, 0xaf, 0x12, 0xf1, 0x57, 0xe9, 0x44,
-	0xfc, 0x35, 0x62, 0x63, 0xf4, 0x30, 0xaa, 0x62, 0x86, 0x56, 0x71, 0x33, 0x6d, 0x02, 0x67, 0xeb,
-	0x78, 0x07, 0x24, 0xec, 0x79, 0x43, 0x8f, 0x56, 0xa8, 0xb8, 0x79, 0x6d, 0x66, 0x24, 0x8d, 0x58,
-	0x19, 0xa1, 0x71, 0xf5, 0xd9, 0x1c, 0xc4, 0xb7, 0x92, 0x88, 0x7f, 0x74, 0x3e, 0xe2, 0x21, 0x2a,
-	0x1c, 0xe6, 0x5b, 0x90, 0x63, 0x50, 0x17, 0x61, 0xa5, 0xa5, 0x35, 0x54, 0xbd, 0xb1, 0x5b, 0xbe,
-	0x84, 0x0a, 0x20, 0x19, 0x5a, 0x4d, 0x7d, 0x52, 0x16, 0x11, 0x40, 0x6e, 0xa7, 0xa6, 0xef, 0x6b,
-	0x6a, 0x39, 0x43, 0x6c, 0x54, 0x6d, 0x5f, 0xeb, 0x68, 0x6a, 0x39, 0x2b, 0xff, 0x29, 0x00, 0x8a,
-	0x0e, 0xad, 0x3b, 0xaf, 0x86, 0x5d, 0x93, 0x92, 0x6d, 0x29, 0x8d, 0x5e, 0x4f, 0x34, 0xfa, 0xfa,
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+	0x96, 0xa0, 0x3c, 0x0d, 0x4e, 0xd4, 0x86, 0x2c, 0xdd, 0x80, 0x43, 0xf6, 0xf5, 0xc2, 0xf5, 0x10,
+	0xb4, 0x8d, 0x92, 0xc2, 0x62, 0xd1, 0x18, 0x79, 0x7b, 0x0e, 0x0e, 0x18, 0x84, 0x79, 0x2b, 0x1a,
+	0xa8, 0xdb, 0x50, 0x4c, 0x5b, 0xa3, 0x55, 0xc8, 0xea, 0xd5, 0x76, 0xb5, 0x74, 0x81, 0x1e, 0xa4,
+	0xd6, 0xa8, 0xb7, 0xad, 0xc6, 0x7e, 0x49, 0x42, 0x08, 0x8a, 0xfa, 0xe3, 0x7a, 0xf5, 0xc0, 0xac,
+	0x3d, 0x6f, 0x1c, 0xb6, 0x9b, 0x87, 0xed, 0x92, 0xac, 0xfe, 0x2a, 0x41, 0x31, 0x7d, 0xc3, 0x2c,
+	0x47, 0x9e, 0xee, 0xa5, 0xe4, 0xe9, 0x93, 0x39, 0x6f, 0x37, 0x41, 0xa8, 0x8c, 0x31, 0xa1, 0xba,
+	0x31, 0x6f, 0x88, 0xb4, 0x64, 0xbd, 0x96, 0x01, 0x9d, 0xdd, 0x23, 0xa1, 0x95, 0xb4, 0x08, 0xad,
+	0x2e, 0x43, 0x8e, 0x3e, 0x5c, 0x4c, 0x9b, 0x17, 0x80, 0x8f, 0x50, 0x63, 0x24, 0x74, 0x99, 0x19,
+	0x57, 0xd6, 0xd9, 0x54, 0x26, 0x4a, 0x9e, 0x0a, 0x6b, 0xce, 0xc8, 0xca, 0xb4, 0xf9, 0xcf, 0xd0,
+	0xd4, 0xdc, 0x5b, 0x7f, 0x99, 0xfe, 0x2d, 0xc3, 0xa5, 0x49, 0xd0, 0xa2, 0xfd, 0x31, 0x41, 0xb8,
+	0xbd, 0x50, 0x65, 0x96, 0x27, 0x0d, 0x89, 0x68, 0x67, 0x16, 0x7f, 0x3d, 0xbe, 0x99, 0x42, 0xbc,
+	0x78, 0xab, 0x2f, 0x22, 0x26, 0x3b, 0x7b, 0x66, 0xb3, 0x69, 0xe8, 0xa5, 0x9c, 0xfa, 0x04, 0x8a,
+	0xe9, 0xee, 0x42, 0x45, 0x90, 0x9d, 0xf8, 0x47, 0x91, 0xec, 0xd8, 0x14, 0xba, 0x8e, 0x4f, 0x38,
+	0x74, 0x99, 0xd9, 0xd0, 0x8d, 0x8c, 0xd5, 0x1f, 0x25, 0x80, 0x04, 0x14, 0x84, 0x04, 0xb5, 0xca,
+	0x27, 0x5a, 0x93, 0xb0, 0x67, 0x8d, 0x13, 0x03, 0xed, 0x42, 0xae, 0x87, 0x8f, 0x48, 0x6f, 0x8e,
+	0x9b, 0x78, 0x14, 0x5e, 0xdb, 0x67, 0x1e, 0x9c, 0xe1, 0x91, 0x7b, 0x65, 0x0b, 0x0a, 0xc2, 0xf4,
+	0x04, 0xf6, 0xa6, 0xf6, 0xcf, 0x8b, 0xc4, 0xbc, 0x0a, 0x0a, 0x2b, 0x0a, 0x2a, 0xc3, 0x4a, 0x9f,
+	0x04, 0x01, 0x3e, 0x8e, 0x8d, 0xe2, 0xa1, 0xda, 0x00, 0x85, 0x35, 0x2e, 0x35, 0xf1, 0x87, 0x6e,
+	0xe8, 0xf4, 0x47, 0x26, 0x7c, 0x88, 0xde, 0x83, 0xbc, 0x8b, 0xfb, 0x24, 0xf0, 0x70, 0x87, 0xf0,
+	0x5f, 0x7d, 0xc9, 0x04, 0x85, 0xda, 0xd4, 0x79, 0xdb, 0xc9, 0xa6, 0xae, 0xbe, 0x96, 0xe0, 0x62,
+	0x72, 0xa2, 0x03, 0xec, 0xd1, 0x2b, 0x97, 0x7d, 0xf3, 0x57, 0xea, 0xcd, 0x39, 0x80, 0x38, 0xc0,
+	0x9e, 0xc6, 0x3e, 0xf8, 0x8f, 0x20, 0xf6, 0x5d, 0x79, 0x0a, 0x90, 0x4c, 0x2e, 0xbf, 0x8d, 0xf7,
+	0xa0, 0x98, 0x2c, 0xec, 0x3b, 0x41, 0x48, 0x03, 0x8a, 0x99, 0xcf, 0x17, 0x90, 0xfd, 0xbb, 0xbf,
+	0xf2, 0x44, 0x61, 0x4b, 0x47, 0x39, 0xc6, 0xaf, 0x5b, 0xff, 0x04, 0x00, 0x00, 0xff, 0xff, 0xf8,
+	0x97, 0xf9, 0x94, 0xe7, 0x14, 0x00, 0x00,
 }
diff --git a/pkg/types/types.proto b/pkg/types/types.proto
index 5ff1b24c..ccdcc1b5 100644
--- a/pkg/types/types.proto
+++ b/pkg/types/types.proto
@@ -233,8 +233,12 @@ message FnRef {
     // Runtime is the Function Runtime environment (fnenv) that was used to resolve the function.
     string runtime = 2;
 
+
+    // Namespace is the namespace of the fission function.
+    string namespace = 3;
+
     // ID is the runtime-specific identifier of the function.
-    string ID = 3;
+    string ID = 4;
 }
 
 // Utility wrapper for a TypedValue map
diff --git a/test/integration/fission/runtime_test.go b/test/integration/fission/runtime_test.go
index 180edd38..49493853 100644
--- a/test/integration/fission/runtime_test.go
+++ b/test/integration/fission/runtime_test.go
@@ -29,6 +29,7 @@ const (
 var executor = executorclient.MakeClient(localhost(executorLocalPort))
 var controller = controllerclient.MakeClient(localhost(controllerLocalPort))
 var testFnName = "fission-runtime-test"
+var testFnNs = "fission-function"
 
 // Currently we assume that fission is present (along with the CLI) and kubectl.
 func TestMain(m *testing.M) {
@@ -80,20 +81,22 @@ func TestMain(m *testing.M) {
 
 func TestFnenvResolve(t *testing.T) {
 	resolver := fission.NewResolver(controller)
-	resolved, err := resolver.Resolve(testFnName)
+	ref, err := types.ParseFnRef(testFnName)
+	assert.NoError(t, err)
+	resolved, err := resolver.Resolve(ref)
 	assert.NoError(t, err)
 	assert.Equal(t, testFnName, resolved)
 }
 
 func TestFnenvNotify(t *testing.T) {
-	fnref := types.NewFnRef(fission.Name, testFnName)
+	fnref := types.NewFnRef(fission.Name, testFnNs, testFnName)
 	fnenv := fission.NewFunctionEnv(executor, localhost(routerLocalPort))
 	err := fnenv.Notify(fnref, time.Now().Add(100*time.Millisecond))
 	assert.NoError(t, err)
 }
 
 func TestFnenvInvoke(t *testing.T) {
-	fnref := types.NewFnRef(fission.Name, testFnName)
+	fnref := types.NewFnRef(fission.Name, testFnNs, testFnName)
 	fnenv := fission.NewFunctionEnv(executor, localhost(routerLocalPort))
 	body := "stubBodyVal"
 	headerVal := "stub-header-val"