diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4cc99930cb..d0a2f14034 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -229,7 +229,12 @@ if(BUILD_DOTNET)
   option(UNIVERSAL_DOTNET_PACKAGE "Build a .Net multi OS Package" OFF)
   message(STATUS ".Net: Create multiple os package: ${UNIVERSAL_DOTNET_PACKAGE}")
 
-  option(USE_DOTNET_TFM_31 "Use .Net Core 3.1 LTS support" ON)
+  # .Net Core 3.1 LTS is not available for osx arm64
+  if(APPLE AND CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
+    set(USE_DOTNET_TFM_31 OFF)
+  else()
+    option(USE_DOTNET_TFM_31 "Use .Net Core 3.1 LTS support" ON)
+  endif()
   message(STATUS ".Net: Use .Net Core 3.1 LTS support: ${USE_DOTNET_TFM_31}")
 
   option(USE_DOTNET_TFM_60 "Use .Net 6.0 LTS support" ON)
diff --git a/cmake/dotnet.cmake b/cmake/dotnet.cmake
index 94af59ba55..0999253899 100644
--- a/cmake/dotnet.cmake
+++ b/cmake/dotnet.cmake
@@ -33,9 +33,17 @@ set(DOTNET_PACKAGES_DIR "${PROJECT_BINARY_DIR}/dotnet/packages")
 
 # see: https://docs.microsoft.com/en-us/dotnet/core/rid-catalog
 if(APPLE)
-  set(RUNTIME_IDENTIFIER osx-x64)
+  if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
+    set(RUNTIME_IDENTIFIER osx-arm64)
+  else()
+    set(RUNTIME_IDENTIFIER osx-x64)
+  endif()
 elseif(UNIX)
-  set(RUNTIME_IDENTIFIER linux-x64)
+  if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
+    set(RUNTIME_IDENTIFIER linux-arm64)
+  else()
+    set(RUNTIME_IDENTIFIER linux-x64)
+  endif()
 elseif(WIN32)
   set(RUNTIME_IDENTIFIER win-x64)
 else()
@@ -46,6 +54,13 @@ message(STATUS ".Net runtime project: ${DOTNET_NATIVE_PROJECT}")
 set(DOTNET_NATIVE_PROJECT_DIR ${PROJECT_BINARY_DIR}/dotnet/${DOTNET_NATIVE_PROJECT})
 message(STATUS ".Net runtime project build path: ${DOTNET_NATIVE_PROJECT_DIR}")
 
+# see: Platform
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
+  set(DOTNET_PLATFORM arm64)
+else()
+  set(DOTNET_PLATFORM x64)
+endif()
+
 # see: https://docs.microsoft.com/en-us/dotnet/standard/frameworks
 if(USE_DOTNET_TFM_31 AND USE_DOTNET_TFM_60)
   set(DOTNET_TFM "<TargetFrameworks>netcoreapp3.1;net6.0</TargetFrameworks>")
@@ -204,7 +219,7 @@ add_custom_command(
 
 add_custom_command(
   OUTPUT ${DOTNET_NATIVE_PROJECT_DIR}/timestamp
-  COMMAND ${DOTNET_EXECUTABLE} build -c Release /p:Platform=x64 ${DOTNET_NATIVE_PROJECT}.csproj
+  COMMAND ${DOTNET_EXECUTABLE} build -c Release /p:Platform=${DOTNET_PLATFORM} ${DOTNET_NATIVE_PROJECT}.csproj
   COMMAND ${DOTNET_EXECUTABLE} pack -c Release ${DOTNET_NATIVE_PROJECT}.csproj
   COMMAND ${CMAKE_COMMAND} -E touch ${DOTNET_NATIVE_PROJECT_DIR}/timestamp
   DEPENDS
@@ -247,7 +262,7 @@ add_custom_command(
 
 add_custom_command(
   OUTPUT ${DOTNET_PROJECT_DIR}/timestamp
-  COMMAND ${DOTNET_EXECUTABLE} build -c Release /p:Platform=x64 ${DOTNET_PROJECT}.csproj
+  COMMAND ${DOTNET_EXECUTABLE} build -c Release /p:Platform=${DOTNET_PLATFORM} ${DOTNET_PROJECT}.csproj
   COMMAND ${DOTNET_EXECUTABLE} pack -c Release ${DOTNET_PROJECT}.csproj
   COMMAND ${CMAKE_COMMAND} -E touch ${DOTNET_PROJECT_DIR}/timestamp
   DEPENDS
@@ -383,13 +398,13 @@ function(add_dotnet_sample FILE_NAME)
   if(BUILD_TESTING)
     if(USE_DOTNET_TFM_31)
       add_test(
-        NAME dotnet_${COMPONENT_NAME}_${SAMPLE_NAME}
+        NAME dotnet_${COMPONENT_NAME}_${SAMPLE_NAME}_netcoreapp31
         COMMAND ${DOTNET_EXECUTABLE} run --no-build --framework netcoreapp3.1 -c Release
         WORKING_DIRECTORY ${DOTNET_SAMPLE_DIR})
     endif()
     if(USE_DOTNET_TFM_60)
       add_test(
-        NAME dotnet_${COMPONENT_NAME}_${SAMPLE_NAME}
+        NAME dotnet_${COMPONENT_NAME}_${SAMPLE_NAME}_net60
         COMMAND ${DOTNET_EXECUTABLE} run --no-build --framework net6.0 -c Release
         WORKING_DIRECTORY ${DOTNET_SAMPLE_DIR})
     endif()
@@ -454,13 +469,13 @@ function(add_dotnet_example FILE_NAME)
   if(BUILD_TESTING)
     if(USE_DOTNET_TFM_31)
       add_test(
-        NAME dotnet_${COMPONENT_NAME}_${EXAMPLE_NAME}
+        NAME dotnet_${COMPONENT_NAME}_${EXAMPLE_NAME}_netcoreapp31
         COMMAND ${DOTNET_EXECUTABLE} run --no-build --framework netcoreapp3.1 -c Release
         WORKING_DIRECTORY ${DOTNET_EXAMPLE_DIR})
     endif()
     if(USE_DOTNET_TFM_60)
       add_test(
-        NAME dotnet_${COMPONENT_NAME}_${EXAMPLE_NAME}
+        NAME dotnet_${COMPONENT_NAME}_${EXAMPLE_NAME}_net60
         COMMAND ${DOTNET_EXECUTABLE} run --no-build --framework net6.0 -c Release
         WORKING_DIRECTORY ${DOTNET_EXAMPLE_DIR})
     endif()
diff --git a/ortools/dotnet/Google.OrTools-full.csproj.in b/ortools/dotnet/Google.OrTools-full.csproj.in
index 509a04f59a..dc0c43c2f4 100644
--- a/ortools/dotnet/Google.OrTools-full.csproj.in
+++ b/ortools/dotnet/Google.OrTools-full.csproj.in
@@ -3,7 +3,7 @@
     <OutputType>Library</OutputType>
     <LangVersion>9.0</LangVersion>
     @DOTNET_TFM@
-    <RuntimeIdentifiers>win-x64;osx-x64;linux-x64</RuntimeIdentifiers>
+    <RuntimeIdentifiers>linux-x64;osx-x64;win-x64;linux-arm64;osx-arm64</RuntimeIdentifiers>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <AssemblyName>@DOTNET_PROJECT@</AssemblyName>
     <Version>@PROJECT_VERSION@</Version>