diff --git a/src/Tasks/Common/MetadataKeys.cs b/src/Tasks/Common/MetadataKeys.cs
index aa0522eb3718..5569d9a584ed 100644
--- a/src/Tasks/Common/MetadataKeys.cs
+++ b/src/Tasks/Common/MetadataKeys.cs
@@ -129,6 +129,8 @@ internal static class MetadataKeys
         public const string IsVersion5 = "IsVersion5";
         public const string CreateCompositeImage = "CreateCompositeImage";
         public const string PerfmapFormatVersion = "PerfmapFormatVersion";
+        public const string RequiresNativeLink = "RequiresNativeLink";
+        public const string NativeLinkerInputPath = "NativeLinkerInputPath";
 
         // Debug symbols
         public const string RelatedProperty = "related";
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/PrepareForReadyToRunCompilation.cs b/src/Tasks/Microsoft.NET.Build.Tasks/PrepareForReadyToRunCompilation.cs
index b990120d246e..423e5e6e1aea 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/PrepareForReadyToRunCompilation.cs
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/PrepareForReadyToRunCompilation.cs
@@ -20,6 +20,7 @@ public class PrepareForReadyToRunCompilation : TaskBase
         public bool EmitSymbols { get; set; }
         public bool ReadyToRunUseCrossgen2 { get; set; }
         public bool Crossgen2Composite { get; set; }
+        public string Crossgen2ContainerFormat { get; set; }
 
         [Required]
         public string OutputPath { get; set; }
@@ -278,7 +279,21 @@ private void ProcessInputFileList(
 
                 var compositeR2RImageRelativePath = MainAssembly.GetMetadata(MetadataKeys.RelativePath);
                 compositeR2RImageRelativePath = Path.ChangeExtension(compositeR2RImageRelativePath, "r2r" + Path.GetExtension(compositeR2RImageRelativePath));
+
+                // For non-PE formats, we may need to do a post-processing step to get the final R2R image
+                // after running crossgen2. In this case, compositeR2RImageRelativePath is the intermediate file
+                // produced by crossgen2, and compositeR2RFinalImageRelativePath is the final file to be published
+                // by any post-crossgen2 linking steps and used at runtime.
+                var compositeR2RFinalImageRelativePath = compositeR2RImageRelativePath;
+
+                if (Crossgen2ContainerFormat == "macho")
+                {
+                    compositeR2RImageRelativePath = Path.ChangeExtension(compositeR2RImageRelativePath, ".o");
+                    compositeR2RFinalImageRelativePath = Path.ChangeExtension(compositeR2RImageRelativePath, ".dylib");
+                }
+
                 var compositeR2RImage = Path.Combine(OutputPath, compositeR2RImageRelativePath);
+                var compositeR2RImageFinal = Path.Combine(OutputPath, compositeR2RFinalImageRelativePath);
 
                 TaskItem r2rCompilationEntry = new(MainAssembly)
                 {
@@ -333,10 +348,17 @@ private void ProcessInputFileList(
                 // Publish it
                 TaskItem compositeR2RFileToPublish = new(MainAssembly)
                 {
-                    ItemSpec = compositeR2RImage
+                    ItemSpec = compositeR2RImageFinal
                 };
                 compositeR2RFileToPublish.RemoveMetadata(MetadataKeys.OriginalItemSpec);
-                compositeR2RFileToPublish.SetMetadata(MetadataKeys.RelativePath, compositeR2RImageRelativePath);
+                compositeR2RFileToPublish.SetMetadata(MetadataKeys.RelativePath, compositeR2RFinalImageRelativePath);
+
+                if (compositeR2RImageFinal != compositeR2RImage)
+                {
+                    compositeR2RFileToPublish.SetMetadata(MetadataKeys.RequiresNativeLink, "true");
+                    compositeR2RFileToPublish.SetMetadata(MetadataKeys.NativeLinkerInputPath, compositeR2RImage);
+                }
+
                 r2rFilesPublishList.Add(compositeR2RFileToPublish);
             }
         }
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/RunReadyToRunCompiler.cs b/src/Tasks/Microsoft.NET.Build.Tasks/RunReadyToRunCompiler.cs
index feca628b33d5..c5c7523099e7 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/RunReadyToRunCompiler.cs
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/RunReadyToRunCompiler.cs
@@ -24,6 +24,7 @@ public class RunReadyToRunCompiler : ToolTask
         public bool UseCrossgen2 { get; set; }
         public string Crossgen2ExtraCommandLineArgs { get; set; }
         public ITaskItem[] Crossgen2PgoFiles { get; set; }
+        public string Crossgen2ContainerFormat { get; set; }
 
         [Output]
         public bool WarningsDetected { get; set; }
@@ -342,6 +343,11 @@ private string GenerateCrossgen2ResponseFile()
                 }
             }
 
+            if (!string.IsNullOrEmpty(Crossgen2ContainerFormat))
+            {
+                result.AppendLine($"--obj-format:{Crossgen2ContainerFormat}");
+            }
+
             if (!string.IsNullOrEmpty(Crossgen2ExtraCommandLineArgs))
             {
                 foreach (string extraArg in Crossgen2ExtraCommandLineArgs.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.CrossGen.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.CrossGen.targets
index 60115b373731..8bd49dd1839b 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.CrossGen.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.CrossGen.targets
@@ -25,6 +25,14 @@ Copyright (c) .NET Foundation. All rights reserved.
     <PublishReadyToRunUseRuntimePackOptimizationData Condition="'$(PublishReadyToRunUseRuntimePackOptimizationData)' == ''">true</PublishReadyToRunUseRuntimePackOptimizationData>
     <PublishReadyToRunPerfmapFormatVersion Condition="'$(PublishReadyToRunPerfmapFormatVersion)' == ''">1</PublishReadyToRunPerfmapFormatVersion>
     <PublishReadyToRunEmitSymbols Condition="'$(PublishReadyToRunEmitSymbols)' == '' and ('$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos' or '$(TargetPlatformIdentifier)' == 'maccatalyst')">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunContainerFormat Condition="'$(PublishReadyToRunContainerFormat)' == ''">pe</PublishReadyToRunContainerFormat>
+
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('ios-'))">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('tvos-'))">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('iossimulator-'))">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('tvossimulator-'))">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('maccatalyst-'))">false</PublishReadyToRunEmitSymbols>
+    <PublishReadyToRunEmitSymbols Condition="$(RuntimeIdentifier.StartsWith('osx-'))">false</PublishReadyToRunEmitSymbols>
   </PropertyGroup>
 
   <!--
@@ -342,9 +350,11 @@ Copyright (c) .NET Foundation. All rights reserved.
           Condition="'$(_TargetFrameworkVersionWithoutV)' >= '3.0' And '$(PublishReadyToRun)' == 'true' And '$(TargetFrameworkIdentifier)' == '.NETCoreApp'"
           DependsOnTargets="_PrepareForReadyToRunCompilation;
                             _CreateR2RImages;
-                            _CreateR2RSymbols">
+                            _CreateR2RSymbols;
+                            _LinkReadyToRunMachO">
     <ItemGroup>
       <R2RTelemetry Include="PublishReadyToRunUseCrossgen2" Value="$(PublishReadyToRunUseCrossgen2)" />
+      <R2RTelemetry Include="PublishReadyToRunContainerFormat" Value="$(PublishReadyToRunContainerFormat)" />
       <R2RTelemetry Include="Crossgen2PackVersion" Value="%(ResolvedCrossgen2Pack.NuGetPackageVersion)" />
       <R2RTelemetry Include="CompileListCount" Value="@(_ReadyToRunCompileList->Count())" />
       <R2RTelemetry Include="FailedCount" Value="@(_ReadyToRunCompilationFailures->Count())" />
@@ -422,6 +432,7 @@ Copyright (c) .NET Foundation. All rights reserved.
                                      IncludeSymbolsInSingleFile="$(IncludeSymbolsInSingleFile)"
                                      ReadyToRunUseCrossgen2="$(PublishReadyToRunUseCrossgen2)"
                                      Crossgen2Composite="$(PublishReadyToRunComposite)"
+                                     Crossgen2ContainerFormat="$(PublishReadyToRunContainerFormat)"
                                      PublishReadyToRunCompositeExclusions="@(PublishReadyToRunCompositeExclusions)"
                                      PublishReadyToRunCompositeRoots="@(PublishReadyToRunCompositeRoots)">
 
@@ -435,6 +446,11 @@ Copyright (c) .NET Foundation. All rights reserved.
       <Output TaskParameter="ReadyToRunCompositeUnrootedBuildInput" ItemName="_ReadyToRunCompositeUnrootedBuildInput" />
 
     </PrepareForReadyToRunCompilation>
+
+    <ItemGroup>
+      <_ReadyToRunNativeObjectOutputs Include="@(_ReadyToRunFilesToPublish->WithMetadataValue('RequiresNativeLink', 'true'))" />
+      <_ReadyToRunNativeObjectOutputs OutputPath="%(Identity)" />
+    </ItemGroup>
   </Target>
 
   <UsingTask Condition="'$(Crossgen2TasksOverriden)' != 'true'" TaskName="ResolveReadyToRunCompilers" AssemblyFile="$(MicrosoftNETBuildTasksAssembly)" />
@@ -469,6 +485,7 @@ Copyright (c) .NET Foundation. All rights reserved.
                            Crossgen2Tool="@(Crossgen2Tool)"
                            UseCrossgen2="$(PublishReadyToRunUseCrossgen2)"
                            Crossgen2PgoFiles="@(_ReadyToRunPgoFiles)"
+                           Crossgen2ContainerFormat="$(PublishReadyToRunContainerFormat)"
                            Crossgen2ExtraCommandLineArgs="$(PublishReadyToRunCrossgen2ExtraArgs)"
                            ImplementationAssemblyReferences="@(_ReadyToRunAssembliesToReference)"
                            ShowCompilerWarnings="$(PublishReadyToRunShowWarnings)"
@@ -525,4 +542,132 @@ Copyright (c) .NET Foundation. All rights reserved.
                                       Include="@(_ReadyToRunSymbolsCompileList)" />
     </ItemGroup>
   </Target>
+
+  <Target Name="_FindMachOToolchain">
+    <PropertyGroup>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('ios-'))">ios</_AppleTargetOS>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('tvos-'))">tvos</_AppleTargetOS>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('iossimulator-'))">iossimulator</_AppleTargetOS>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('tvossimulator-'))">tvossimulator</_AppleTargetOS>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('maccatalyst-'))">maccatalyst</_AppleTargetOS>
+      <_AppleTargetOS Condition="$(RuntimeIdentifier.StartsWith('osx-'))">osx</_AppleTargetOS>
+
+      <_AppleTargetArchitecture Condition="$(RuntimeIdentifier.EndsWith('-x64'))">x86_64</_AppleTargetArchitecture>
+      <_AppleTargetArchitecture Condition="$(RuntimeIdentifier.EndsWith('-arm64'))">arm64</_AppleTargetArchitecture>
+    </PropertyGroup>
+
+    <PropertyGroup>
+      <AppleMinOSVersion Condition="'$(AppleMinOSVersion)' == '' and '$(_AppleTargetOS)' == 'osx'">12.0</AppleMinOSVersion>
+      <AppleMinOSVersion Condition="'$(AppleMinOSVersion)' == '' and '$(_AppleTargetOS)' == 'maccatalyst'">15.0</AppleMinOSVersion>
+      <AppleMinOSVersion Condition="'$(AppleMinOSVersion)' == '' and ($(_AppleTargetOS.StartsWith('ios')) or $(_AppleTargetOS.StartsWith('tvos')))">12.2</AppleMinOSVersion>
+
+      <_AppleSdkName Condition="'$(_AppleTargetOS)' == 'ios'">iphoneos</_AppleSdkName>
+      <_AppleSdkName Condition="'$(_AppleTargetOS)' == 'iossimulator'">iphonesimulator</_AppleSdkName>
+      <_AppleSdkName Condition="'$(_AppleTargetOS)' == 'tvos'">appletvos</_AppleSdkName>
+      <_AppleSdkName Condition="'$(_AppleTargetOS)' == 'tvossimulator'">appletvsimulator</_AppleSdkName>
+      <_AppleSdkName Condition="'$(_AppleTargetOS)' == 'maccatalyst' or '$(_AppleTargetOS)' == 'osx'">macosx</_AppleSdkName>
+
+      <_AppleTripleOS Condition="'$(_AppleTargetOS)' == 'osx'">macos</_AppleTripleOS>
+      <_AppleTripleOS Condition="'$(_AppleTargetOS)' == 'maccatalyst' or $(_AppleTargetOS.StartsWith('ios'))">ios</_AppleTripleOS>
+      <_AppleTripleOS Condition="$(_AppleTargetOS.StartsWith('tvos'))">tvos</_AppleTripleOS>
+
+      <_AppleTripleAbi Condition="'$(_AppleTargetOS)' == 'ios' or '$(_AppleTargetOS)' == 'tvos'">macho</_AppleTripleAbi>
+      <_AppleTripleAbi Condition="'$(_AppleTargetOS)' == 'maccatalyst'">macabi</_AppleTripleAbi>
+      <_AppleTripleAbi Condition="$(_AppleTargetOS.EndsWith('simulator'))">simulator</_AppleTripleAbi>
+
+      <TargetTriple Condition="'$(_AppleTripleAbi)' == ''">$(_AppleTargetArchitecture)-apple-$(_AppleTripleOS)$(AppleMinOSVersion)</TargetTriple>
+      <TargetTriple Condition="'$(_AppleTripleAbi)' != ''">$(_AppleTargetArchitecture)-apple-$(_AppleTripleOS)$(AppleMinOSVersion)-$(_AppleTripleAbi)</TargetTriple>
+    </PropertyGroup>
+
+    <PropertyGroup>
+      <Xcrun Condition="'$(Xcrun)' == ''">xcrun</Xcrun>
+      <_WhereXcrun>0</_WhereXcrun>
+    </PropertyGroup>
+
+    <Exec Command="command -v &quot;$(Xcrun)&quot;" IgnoreExitCode="true" StandardOutputImportance="Low">
+      <Output TaskParameter="ExitCode" PropertyName="_WhereXcrun" />
+    </Exec>
+    <Error Condition="'$(_WhereXcrun)' != '0'"
+      Text="'$(Xcrun)' not found in PATH. Make sure '$(Xcrun)' is available in PATH." />
+
+    <Exec Command="&quot;$(Xcrun)&quot; --sdk $(_AppleSdkName) --show-sdk-path" IgnoreExitCode="true" StandardOutputImportance="Low" Condition="'$(SysRoot)' == ''" ConsoleToMsBuild="true">
+      <Output TaskParameter="ConsoleOutput" PropertyName="SysRoot" />
+    </Exec>
+
+    <Error Condition="!Exists('$(SysRoot)')"
+      Text="Apple SDK was not found in: '$(SysRoot)'" />
+
+    <Exec Command="&quot;$(Xcrun)&quot; --sdk $(_AppleSdkName) --find clang" IgnoreExitCode="true" StandardOutputImportance="Low" ConsoleToMsBuild="true">
+      <Output TaskParameter="ConsoleOutput" PropertyName="_AppleClang" />
+    </Exec>
+
+    <Error Condition="!Exists('$(_AppleClang)')"
+      Text="Apple Clang was not found at: '$(_AppleClang)'" />
+
+    <Exec Command="dsymutil --help" IgnoreExitCode="true" StandardOutputImportance="Low" Condition="'$(StripSymbols)' == 'true'" ConsoleToMsBuild="true">
+      <Output TaskParameter="ConsoleOutput" PropertyName="_DsymUtilOutput" />
+    </Exec>
+
+    <PropertyGroup Condition="'$(StripSymbols)' == 'true' and $(_DsymUtilOutput.Contains('--minimize'))">
+      <DsymUtilOptions>$(DsymUtilOptions) --minimize</DsymUtilOptions>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <_MachLinkerArg Include="-gz=zlib" Condition="'$(CompressSymbols)' != 'false'" />
+      <_MachLinkerArg Include="-isysroot &quot;$(SysRoot)&quot;" Condition="'$(SysRoot)' != ''" />
+      <_MachLinkerArg Include="--target=$(TargetTriple)" />
+      <_MachLinkerArg Include="-g" Condition="'$(NativeDebugSymbols)' == 'true'" />
+      <_MachLinkerArg Include="-dynamiclib" />
+      <_MachLinkerArg Include="-Wl,-dead_strip" />
+    </ItemGroup>
+
+    <Exec Command="&quot;$(_AppleClang)&quot; --version" IgnoreExitCode="true" IgnoreStandardErrorWarningFormat="true" StandardOutputImportance="Low" ConsoleToMSBuild="true">
+      <Output TaskParameter="ExitCode" PropertyName="_XcodeVersionStringExitCode" />
+      <Output TaskParameter="ConsoleOutput" PropertyName="_XcodeVersionString" />
+    </Exec>
+
+    <PropertyGroup Condition="('$(_XcodeVersionStringExitCode)' == '0' or '$(_XcodeVersionStringExitCode)' == '1') and '$(_XcodeVersionString)' != ''">
+      <_XcodeVersion>$([System.Text.RegularExpressions.Regex]::Match($(_XcodeVersionString), '[1-9]\d*'))</_XcodeVersion>
+    </PropertyGroup>
+
+    <ItemGroup Condition="'$(UseLdClassicXCodeLinker)' != 'false'">
+      <_MachLinkerArg Condition="'$(UseLdClassicXCodeLinker)' == 'true' or '$(_XcodeVersion)' == '15' or '$(_XcodeVersion)' == '16'" Include="-ld_classic" />
+    </ItemGroup>
+
+    <PropertyGroup Condition="'$(UseLdClassicXCodeLinker)' != 'false'">
+      <!-- Xcode 16 warns on -ld_classic -->
+      <_IgnoreLinkerWarnings Condition="'$(_XcodeVersion)' == '16'">true</_IgnoreLinkerWarnings>
+    </PropertyGroup>
+  </Target>
+
+  <!-- Crossgen2 will produce a Mach-O object file. This target will link it into a dylib that can be consumed by the runtime. -->
+  <Target Name="_LinkReadyToRunMachO"
+    DependsOnTargets="_FindMachOToolchain"
+    Inputs="@(_ReadyToRunNativeObjectOutputs->'%(NativeLinkerInputPath)')"
+    Outputs="%(_ReadyToRunNativeObjectOutputs.Identity)"
+    Condition="'$(PublishReadyToRunContainerFormat)' == 'macho'">
+
+    <PropertyGroup>
+      <SharedLibraryInstallName Condition="'$(SharedLibraryInstallName)' == ''">@rpath/%(_ReadyToRunNativeObjectOutputs.Filename)%(_ReadyToRunNativeObjectOutputs.Extension)</SharedLibraryInstallName>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <_MachLinkerArg Include="-Wl,-install_name,&quot;$(SharedLibraryInstallName)&quot;" />
+      <_MachLinkerArg Include="%(_ReadyToRunNativeObjectOutputs.NativeLinkerInputPath)" />
+      <_MachLinkerArg Include="-o %(_ReadyToRunNativeObjectOutputs.Identity)" />
+    </ItemGroup>
+
+    <MakeDir Directories="$([System.IO.Path]::GetDirectoryName(%(_ReadyToRunNativeObjectOutputs.Identity)))" />
+
+    <Exec Command="&quot;$(_AppleClang)&quot; @(_MachLinkerArg, ' ')"
+          IgnoreStandardErrorWarningFormat="$(_IgnoreLinkerWarnings)"/>
+
+    <!-- remove executable flag -->
+    <Exec Command="chmod 644 &quot;%(_ReadyToRunNativeObjectOutputs.Identity)&quot;" />
+
+    <Exec Condition="'$(StripSymbols)' == 'true'"
+      Command="
+        dsymutil $(DsymUtilOptions) &quot;%(_ReadyToRunNativeObjectOutputs.Identity)&quot; &amp;&amp;
+        strip -no_code_signature_warning -x &quot;%(_ReadyToRunNativeObjectOutputs.Identity)&quot;" />
+  </Target>
 </Project>