diff --git a/src/mono/sample/iOS/Makefile b/src/mono/sample/iOS/Makefile
index 7d4a6c680fcc1..be7c2bcefe0aa 100644
--- a/src/mono/sample/iOS/Makefile
+++ b/src/mono/sample/iOS/Makefile
@@ -18,5 +18,21 @@ run: clean appbuilder
 	$(DOTNET) publish -c $(MONO_CONFIG) /p:TargetArchitecture=$(MONO_ARCH) \
 	/p:UseLLVM=$(USE_LLVM) /p:ForceAOT=$(AOT)
 
+run-sim: clean appbuilder
+	$(DOTNET) publish -c $(MONO_CONFIG) /p:TargetOS=iOSSimulator /p:TargetArchitecture=$(MONO_ARCH) \
+	/p:UseLLVM=$(USE_LLVM) /p:ForceAOT=$(AOT)
+
+run-catalyst:
+	$(DOTNET) publish -c $(MONO_CONFIG) /p:TargetOS=MacCatalyst /p:TargetArchitecture=$(MONO_ARCH) \
+	/p:UseLLVM=False /p:ForceAOT=False
+
+run-sim-interp: clean appbuilder
+	$(DOTNET) publish -c $(MONO_CONFIG) /p:TargetOS=iOSSimulator /p:TargetArchitecture=$(MONO_ARCH) \
+	/p:UseLLVM=$(USE_LLVM) /p:ForceAOT=$(AOT) /p:MonoForceInterpreter=true
+
+run-catalyst-interp:
+	$(DOTNET) publish -c $(MONO_CONFIG) /p:TargetOS=MacCatalyst /p:TargetArchitecture=$(MONO_ARCH) \
+	/p:UseLLVM=False /p:ForceAOT=False /p:MonoForceInterpreter=true
+
 clean:
 	rm -rf bin
diff --git a/src/mono/sample/iOS/Program.csproj b/src/mono/sample/iOS/Program.csproj
index 56f3124b3865c..580d61cf70fb9 100644
--- a/src/mono/sample/iOS/Program.csproj
+++ b/src/mono/sample/iOS/Program.csproj
@@ -8,11 +8,19 @@
     <MicrosoftNetCoreAppRuntimePackDir>$(ArtifactsBinDir)microsoft.netcore.app.runtime.$(TargetOS.ToLower())-$(TargetArchitecture)\$(Configuration)\runtimes\$(TargetOS.ToLower())-$(TargetArchitecture)\</MicrosoftNetCoreAppRuntimePackDir>
     <EnableTargetingPackDownload>false</EnableTargetingPackDownload>
     <RuntimeIdentifier>$(TargetOS.ToLower())-$(TargetArchitecture)</RuntimeIdentifier>
-    <PublishTrimmed>true</PublishTrimmed>
-    <TrimMode>Link</TrimMode>
     <DefineConstants Condition="'$(ArchiveTests)' == 'true'">$(DefineConstants);CI_TEST</DefineConstants>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <!-- FIXME: for some reason trimming is throwing errors about something in System.Diagnostics. -->
+    <!-- <PublishTrimmed>true</PublishTrimmed> -->
+    <!-- <TrimMode>Link</TrimMode> -->
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(TargetOS)' == 'MacCatalyst'">
+    <DevTeamProvisioning Condition="'$(TargetOS)' == 'MacCatalyst' and '$(DevTeamProvisioning)' == ''">-</DevTeamProvisioning>
+  </PropertyGroup>
+
   <!-- Redirect 'dotnet publish' to in-tree runtime pack -->
   <Target Name="TrickRuntimePackLocation" AfterTargets="ProcessFrameworkReferences">
     <ItemGroup>
@@ -35,7 +43,7 @@
       <AppDir>$(MSBuildThisFileDirectory)$(PublishDir)\app</AppDir>
       <IosSimulator Condition="'$(TargetsiOSSimulator)' == 'true'">iPhone 11</IosSimulator>
       <Optimized Condition="'$(Configuration)' == 'Release'">True</Optimized>
-      <RunAOTCompilation Condition="'$(IosSimulator)' == '' or '$(ForceAOT)' == 'true'">true</RunAOTCompilation>
+      <RunAOTCompilation Condition="('$(TargetsMacCatalyst)' == 'false' and '$(IosSimulator)' == '') or '$(ForceAOT)' == 'true'">true</RunAOTCompilation>
     </PropertyGroup>
 
     <RemoveDir Directories="$(AppDir)" />
@@ -83,11 +91,16 @@
     <Message Importance="High" Text="Xcode: $(XcodeProjectPath)"/>
     <Message Importance="High" Text="App:   $(AppBundlePath)"/>
 
+    <!-- install and run on ios simulator -->
     <Exec Condition="'$(IosSimulator)' != '' and '$(ArchiveTests)' != 'true'" Command="xcrun simctl shutdown &quot;$(IosSimulator)&quot;" ContinueOnError="WarnAndContinue" />
     <Exec Condition="'$(IosSimulator)' != '' and '$(ArchiveTests)' != 'true'" Command="xcrun simctl boot &quot;$(IosSimulator)&quot;" />
     <Exec Condition="'$(IosSimulator)' != '' and '$(ArchiveTests)' != 'true'" Command="open -a Simulator" />
     <Exec Condition="'$(IosSimulator)' != '' and '$(ArchiveTests)' != 'true'" Command="xcrun simctl install &quot;$(IosSimulator)&quot; $(AppBundlePath)" />
     <Exec Condition="'$(IosSimulator)' != '' and '$(ArchiveTests)' != 'true'" Command="xcrun simctl launch --console booted net.dot.HelloiOS" />
+
+    <!-- run on MacCatalyst -->
+    <Exec Condition="'$(TargetOS)' == 'MacCatalyst'" Command="dotnet xharness apple run --app=$(AppBundlePath) --targets=maccatalyst --output-directory=/tmp/out" />
+
   </Target>
 
   <Target Name="CopySampleAppToHelixTestDir" 
diff --git a/src/tasks/AppleAppBuilder/Templates/CMakeLists.txt.template b/src/tasks/AppleAppBuilder/Templates/CMakeLists.txt.template
index 7fea422c6b4e2..4dcd8b645bb52 100644
--- a/src/tasks/AppleAppBuilder/Templates/CMakeLists.txt.template
+++ b/src/tasks/AppleAppBuilder/Templates/CMakeLists.txt.template
@@ -31,6 +31,21 @@ set_target_properties(%ProjectName% PROPERTIES
     RESOURCE "${APP_RESOURCES}"
 )
 
+set(HARDENED_RUNTIME
+%HardenedRuntime%
+)
+
+set(HARDENED_RUNTIME_USE_ENTITLEMENTS_FILE
+%HardenedRuntimeUseEntitlementsFile%
+)
+
+if("${HARDENED_RUNTIME}")
+  set_target_properties(%ProjectName% PROPERTIES XCODE_ATTRIBUTE_HARDENED_RUNTIME "YES")
+  if("${HARDENED_RUNTIME_USE_ENTITLEMENTS_FILE}")
+    set_target_properties(%ProjectName% PROPERTIES XCODE_ATTRIBUTE_CODE_SIGN_ENTITLEMENTS "app.entitlements")
+  endif()
+endif()
+
 # FIXME: `XCODE_ATTRIBUTE_DEAD_CODE_STRIPPING` should not be NO
 
 target_link_libraries(
diff --git a/src/tasks/AppleAppBuilder/Templates/app.entitlements.template b/src/tasks/AppleAppBuilder/Templates/app.entitlements.template
new file mode 100644
index 0000000000000..e3737e695acb4
--- /dev/null
+++ b/src/tasks/AppleAppBuilder/Templates/app.entitlements.template
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+%Entitlements%
+</dict>
+</plist>
diff --git a/src/tasks/AppleAppBuilder/Templates/runtime.m b/src/tasks/AppleAppBuilder/Templates/runtime.m
index ef8bdbd4dfce5..17c8be6ff0463 100644
--- a/src/tasks/AppleAppBuilder/Templates/runtime.m
+++ b/src/tasks/AppleAppBuilder/Templates/runtime.m
@@ -246,14 +246,14 @@
     const char *appctx_keys [] = {
         "RUNTIME_IDENTIFIER", 
         "APP_CONTEXT_BASE_DIRECTORY",
-#ifndef INVARIANT_GLOBALIZATION
+#if !defined(INVARIANT_GLOBALIZATION) && !TARGET_OS_MACCATALYST
         "ICU_DAT_FILE_PATH"
 #endif
     };
     const char *appctx_values [] = {
         APPLE_RUNTIME_IDENTIFIER,
         bundle,
-#ifndef INVARIANT_GLOBALIZATION
+#if !defined(INVARIANT_GLOBALIZATION) && !TARGET_OS_MACCATALYST
         icu_dat_path
 #endif
     };
diff --git a/src/tasks/AppleAppBuilder/Xcode.cs b/src/tasks/AppleAppBuilder/Xcode.cs
index dcba5f973e9c2..442eb539af38b 100644
--- a/src/tasks/AppleAppBuilder/Xcode.cs
+++ b/src/tasks/AppleAppBuilder/Xcode.cs
@@ -83,11 +83,24 @@ public string GenerateXCode(
             }
         }
 
+        var entitlements = new List<KeyValuePair<string, string>>();
+
+        bool hardenedRuntime = false;
+        if (Target == TargetNames.MacCatalyst && !(forceInterpreter || forceAOT)) {
+            hardenedRuntime = true;
+
+            /* for mmmap MAP_JIT */
+            entitlements.Add (KeyValuePair.Create ("com.apple.security.cs.allow-jit", "<true/>"));
+            /* for loading unsigned dylibs like libicu from outside the bundle or libSystem.Native.dylib from inside */
+            entitlements.Add (KeyValuePair.Create ("com.apple.security.cs.disable-library-validation", "<true/>"));
+        }
+
         string cmakeLists = Utils.GetEmbeddedResource("CMakeLists.txt.template")
             .Replace("%ProjectName%", projectName)
             .Replace("%AppResources%", string.Join(Environment.NewLine, resources.Select(r => "    " + r)))
             .Replace("%MainSource%", nativeMainSource)
-            .Replace("%MonoInclude%", monoInclude);
+            .Replace("%MonoInclude%", monoInclude)
+            .Replace("%HardenedRuntime%", hardenedRuntime ? "TRUE" : "FALSE");
 
 
         string[] dylibs = Directory.GetFiles(workspace, "*.dylib");
@@ -152,8 +165,23 @@ public string GenerateXCode(
             .Replace("%BundleIdentifier%", projectName);
 
         File.WriteAllText(Path.Combine(binDir, "Info.plist"), plist);
+
+        var needEntitlements = entitlements.Count != 0;
+        cmakeLists = cmakeLists.Replace("%HardenedRuntimeUseEntitlementsFile%",
+                                        needEntitlements ? "TRUE" : "FALSE");
+
         File.WriteAllText(Path.Combine(binDir, "CMakeLists.txt"), cmakeLists);
 
+        if (needEntitlements) {
+            var ent = new StringBuilder();
+            foreach ((var key, var value) in entitlements) {
+                ent.AppendLine ($"<key>{key}</key>");
+                ent.AppendLine (value);
+            }
+            string entitlementsTemplate = Utils.GetEmbeddedResource("app.entitlements.template");
+            File.WriteAllText(Path.Combine(binDir, "app.entitlements"), entitlementsTemplate.Replace("%Entitlements%", ent.ToString()));
+        }
+
         string targetName;
         switch (Target)
         {