diff --git a/flytekit/image_spec/image_spec.py b/flytekit/image_spec/image_spec.py
index 027b5e0b47..b4772d1a92 100644
--- a/flytekit/image_spec/image_spec.py
+++ b/flytekit/image_spec/image_spec.py
@@ -46,6 +46,8 @@ class ImageSpec:
         pip_extra_index_url: Specify one or more pip index urls as a list
         registry_config: Specify the path to a JSON registry config file
         commands: Command to run during the building process
+        tag_format: Custom string format for image tag. The ImageSpec hash passed in as `spec_hash`. For example,
+            to add a "dev" suffix to the image tag, set `tag_format="{spec_hash}-dev"`
     """
 
     name: str = "flytekit"
@@ -67,6 +69,7 @@ class ImageSpec:
     pip_extra_index_url: Optional[List[str]] = None
     registry_config: Optional[str] = None
     commands: Optional[List[str]] = None
+    tag_format: Optional[str] = None
 
     def __post_init__(self):
         self.name = self.name.lower()
@@ -85,6 +88,9 @@ def image_name(self) -> str:
     def _image_name(self) -> str:
         """Construct full image name with tag."""
         tag = calculate_hash_from_image_spec(self)
+        if self.tag_format:
+            tag = self.tag_format.format(spec_hash=tag)
+
         container_image = f"{self.name}:{tag}"
         if self.registry:
             container_image = f"{self.registry}/{container_image}"
diff --git a/tests/flytekit/unit/core/image_spec/test_image_spec.py b/tests/flytekit/unit/core/image_spec/test_image_spec.py
index f1b0bbe975..15b14f6687 100644
--- a/tests/flytekit/unit/core/image_spec/test_image_spec.py
+++ b/tests/flytekit/unit/core/image_spec/test_image_spec.py
@@ -112,3 +112,13 @@ def test_build_existing_image_with_force_push():
 
     ImageBuildEngine.build(image_spec)
     ImageBuildEngine._build_image.assert_called_once()
+
+
+def test_custom_tag():
+    spec = ImageSpec(
+        name="my_image",
+        python_version="3.11",
+        tag_format="{spec_hash}-dev",
+    )
+    spec_hash = calculate_hash_from_image_spec(spec)
+    assert spec.image_name() == f"my_image:{spec_hash}-dev"