diff --git a/change/react-native-windows-2020-04-30-18-28-03-abi-safety.json b/change/react-native-windows-2020-04-30-18-28-03-abi-safety.json
new file mode 100644
index 00000000000..7cf31717cd8
--- /dev/null
+++ b/change/react-native-windows-2020-04-30-18-28-03-abi-safety.json
@@ -0,0 +1,8 @@
+{
+  "type": "none",
+  "comment": "test bundle build logic, JS function call test",
+  "packageName": "react-native-windows",
+  "email": "aeulitz@microsoft.com",
+  "dependentChangeType": "none",
+  "date": "2020-05-01T01:28:03.315Z"
+}
diff --git a/change/react-native-windows-2020-05-09-17-42-52-abi-safety.json b/change/react-native-windows-2020-05-09-17-42-52-abi-safety.json
new file mode 100644
index 00000000000..ef25becd822
--- /dev/null
+++ b/change/react-native-windows-2020-05-09-17-42-52-abi-safety.json
@@ -0,0 +1,8 @@
+{
+  "type": "prerelease",
+  "comment": "add ReactNativeHost to Win32 C++/WinRT ABI",
+  "packageName": "react-native-windows",
+  "email": "aeulitz@microsoft.com",
+  "dependentChangeType": "patch",
+  "date": "2020-05-10T00:42:52.866Z"
+}
diff --git a/vnext/Desktop.ABITests/ActivationFactory.cpp b/vnext/Desktop.ABITests/ActivationFactory.cpp
index 81ff78b6cf7..19915c7e683 100644
--- a/vnext/Desktop.ABITests/ActivationFactory.cpp
+++ b/vnext/Desktop.ABITests/ActivationFactory.cpp
@@ -26,7 +26,7 @@ int32_t __stdcall WINRT_RoGetActivationFactory(void *classId, guid const &iid, v
   std::wstring_view const name{*reinterpret_cast<winrt::hstring *>(&classId)};
   HMODULE library{nullptr};
 
-  if (starts_with(name, L"facebook.react.")) {
+  if (starts_with(name, L"facebook.react.") || starts_with(name, L"Microsoft.React")) {
     library = LoadLibraryExW(RNDLLPATH, NULL, LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
   } else {
     return OS_RoGetActivationFactory(classId, iid, factory);
diff --git a/vnext/Desktop.ABITests/ActivationFactory.h b/vnext/Desktop.ABITests/ActivationFactory.h
new file mode 100644
index 00000000000..e53f76d24ce
--- /dev/null
+++ b/vnext/Desktop.ABITests/ActivationFactory.h
@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+#include "pch.h"
+#include <Windows.h>
+#include <winrt/base.h>
+
+extern int32_t __stdcall WINRT_RoGetActivationFactory(void *classId, winrt::guid const &iid, void **factory) noexcept;
diff --git a/vnext/Desktop.ABITests/MemoryTrackerTests.cpp b/vnext/Desktop.ABITests/MemoryTrackerTests.cpp
index ce3da0f7549..79ad888716c 100644
--- a/vnext/Desktop.ABITests/MemoryTrackerTests.cpp
+++ b/vnext/Desktop.ABITests/MemoryTrackerTests.cpp
@@ -7,14 +7,13 @@
 #include <winrt/base.h>
 #include <winrt/facebook.react.h>
 
+#include "ActivationFactory.h"
 #include "MessageQueueShim.h"
 
 using namespace Microsoft::React::Test;
 using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 using namespace winrt::facebook::react;
 
-int32_t __stdcall WINRT_RoGetActivationFactory(void *classId, winrt::guid const &iid, void **factory) noexcept;
-
 namespace ABITests {
 
 // We turn clang format off here because it does not work with some of the
diff --git a/vnext/Desktop.ABITests/NativeLogEventTests.cpp b/vnext/Desktop.ABITests/NativeLogEventTests.cpp
index d23fd4ae2ad..859b84dca56 100644
--- a/vnext/Desktop.ABITests/NativeLogEventTests.cpp
+++ b/vnext/Desktop.ABITests/NativeLogEventTests.cpp
@@ -5,13 +5,12 @@
 #include <CppUnitTest.h>
 #include <winrt/facebook.react.h>
 #include <vector>
+#include "ActivationFactory.h"
 
 using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 using namespace winrt::facebook::react;
 using namespace winrt;
 
-int32_t __stdcall WINRT_RoGetActivationFactory(void *classId, winrt::guid const &iid, void **factory) noexcept;
-
 namespace ABITests {
 
 TEST_CLASS (NativeLogEventTests) {
diff --git a/vnext/Desktop.ABITests/NativeTraceEventTests.cpp b/vnext/Desktop.ABITests/NativeTraceEventTests.cpp
index 371589c30a1..16348920fa3 100644
--- a/vnext/Desktop.ABITests/NativeTraceEventTests.cpp
+++ b/vnext/Desktop.ABITests/NativeTraceEventTests.cpp
@@ -6,13 +6,12 @@
 #include <winrt/facebook.react.h>
 #include <functional>
 #include <stack>
+#include "ActivationFactory.h"
 
 using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 using namespace winrt::facebook::react;
 using namespace winrt;
 
-int32_t __stdcall WINRT_RoGetActivationFactory(void *classId, winrt::guid const &iid, void **factory) noexcept;
-
 namespace ABITests {
 
 TEST_CLASS (NativeTraceEventTests) {
diff --git a/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj b/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj
index ec0af2a58ba..c4972ba5924 100644
--- a/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj
+++ b/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj
@@ -103,6 +103,9 @@
       <CppWinRTDynamicProjectWinMDReferences Include="$(OutputPath)..\React.Windows.Desktop\facebook.react.winmd">
         <WinMDPath>$(OutputPath)..\React.Windows.Desktop\facebook.react.winmd</WinMDPath>
       </CppWinRTDynamicProjectWinMDReferences>
+      <CppWinRTDynamicProjectWinMDReferences Include="$(OutputPath)..\React.Windows.Desktop\Microsoft.ReactNative.winmd">
+        <WinMDPath>$(OutputPath)..\React.Windows.Desktop\Microsoft.ReactNative.winmd</WinMDPath>
+      </CppWinRTDynamicProjectWinMDReferences>
     </ItemGroup>
   </Target>
   <Target Name="GetRNDllPath" BeforeTargets="ClCompile">
@@ -133,9 +136,11 @@
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Create</PrecompiledHeader>
     </ClCompile>
     <ClCompile Include="PerfTests.cpp" />
+    <ClCompile Include="ReactNativeHostTests.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="MessageQueueShim.h" />
+    <ClInclude Include="ActivationFactory.h" />
     <ClInclude Include="pch.h" />
   </ItemGroup>
   <ItemGroup>
diff --git a/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj.filters b/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj.filters
index 49daa4eb2a2..76bd4b11819 100644
--- a/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj.filters
+++ b/vnext/Desktop.ABITests/React.Windows.Desktop.ABITests.vcxproj.filters
@@ -36,6 +36,9 @@
     <ClCompile Include="PerfTests.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="ReactNativeHostTests.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="MessageQueueShim.h">
@@ -44,6 +47,9 @@
     <ClInclude Include="pch.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="ActivationFactory.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
diff --git a/vnext/Desktop.ABITests/ReactNativeHostTests.cpp b/vnext/Desktop.ABITests/ReactNativeHostTests.cpp
new file mode 100644
index 00000000000..7206f5b8daf
--- /dev/null
+++ b/vnext/Desktop.ABITests/ReactNativeHostTests.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#include "pch.h"
+#include <CppUnitTest.h>
+#include <winrt/Microsoft.ReactNative.h>
+#include "ActivationFactory.h"
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace ABITests {
+
+TEST_CLASS (ReactNativeHostTests) {
+ public:
+  ReactNativeHostTests() noexcept {
+    winrt_activation_handler = WINRT_RoGetActivationFactory;
+  }
+
+  TEST_METHOD(Activation_Succeeds) {
+    try {
+      winrt::Microsoft::ReactNative::ReactNativeHost host{};
+      Assert::IsTrue(true);
+    } catch (...) {
+      Assert::Fail();
+    }
+  }
+};
+
+} // namespace ABITests
diff --git a/vnext/Desktop/ABI/ReactNativeHost.cpp b/vnext/Desktop/ABI/ReactNativeHost.cpp
new file mode 100644
index 00000000000..4486d9a209f
--- /dev/null
+++ b/vnext/Desktop/ABI/ReactNativeHost.cpp
@@ -0,0 +1,66 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#include <pch.h>
+#include "ReactNativeHost.h"
+
+#include "Microsoft.ReactNative.ReactNativeHost.g.cpp"
+
+using namespace winrt::Windows::Foundation::Collections;
+
+namespace winrt::Microsoft::ReactNative::implementation {
+
+ReactNativeHost::ReactNativeHost() noexcept {
+  // TODO: implement
+}
+
+IVector<IReactPackageProvider> ReactNativeHost::PackageProviders() noexcept {
+  if (!m_packageProviders) {
+    m_packageProviders = single_threaded_vector<IReactPackageProvider>();
+  }
+
+  return m_packageProviders;
+}
+
+void ReactNativeHost::PackageProviders(IVector<IReactPackageProvider> const &value) noexcept {
+  m_packageProviders = value;
+}
+
+ReactNative::ReactInstanceSettings ReactNativeHost::InstanceSettings() noexcept {
+  if (!m_instanceSettings) {
+    // TODO: implement
+    // m_instanceSettings = make<ReactInstanceSettings>();
+  }
+
+  return m_instanceSettings;
+}
+
+void ReactNativeHost::InstanceSettings(ReactNative::ReactInstanceSettings const &value) noexcept {
+  m_instanceSettings = value;
+}
+
+void ReactNativeHost::ReloadInstance() noexcept {
+  // TODO: implement
+}
+
+void ReactNativeHost::OnSuspend() noexcept {
+  // TODO: implement
+}
+
+void ReactNativeHost::OnEnteredBackground() noexcept {
+  // TODO: implement
+}
+
+void ReactNativeHost::OnLeavingBackground() noexcept {
+  // TODO: implement
+}
+
+void ReactNativeHost::OnResume(OnResumeAction const & /*action*/) noexcept {
+  // TODO: implement
+}
+
+void ReactNativeHost::OnBackPressed() noexcept {
+  // TODO: implement
+}
+
+} // namespace winrt::Microsoft::ReactNative::implementation
diff --git a/vnext/Desktop/ABI/ReactNativeHost.h b/vnext/Desktop/ABI/ReactNativeHost.h
new file mode 100644
index 00000000000..f1596c4b49b
--- /dev/null
+++ b/vnext/Desktop/ABI/ReactNativeHost.h
@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+#include <winrt/Windows.Foundation.Collections.h>
+
+#include "Microsoft.ReactNative.ReactNativeHost.g.h"
+
+namespace winrt::Microsoft::ReactNative::implementation {
+
+struct ReactNativeHost : ReactNativeHostT<ReactNativeHost> {
+  ReactNativeHost() noexcept;
+
+  // property PackageProviders
+  Windows::Foundation::Collections::IVector<IReactPackageProvider> PackageProviders() noexcept;
+  void PackageProviders(Windows::Foundation::Collections::IVector<IReactPackageProvider> const &value) noexcept;
+
+  // property InstanceSettings
+  ReactNative::ReactInstanceSettings InstanceSettings() noexcept;
+  void InstanceSettings(ReactNative::ReactInstanceSettings const &value) noexcept;
+
+  void ReloadInstance() noexcept;
+
+  void OnSuspend() noexcept;
+  void OnEnteredBackground() noexcept;
+  void OnLeavingBackground() noexcept;
+  void OnResume(OnResumeAction const &action) noexcept;
+  void OnBackPressed() noexcept;
+
+ private:
+  ReactNative::ReactInstanceSettings m_instanceSettings{nullptr};
+  Windows::Foundation::Collections::IVector<IReactPackageProvider> m_packageProviders;
+};
+
+} // namespace winrt::Microsoft::ReactNative::implementation
+
+namespace winrt::Microsoft::ReactNative::factory_implementation {
+
+struct ReactNativeHost : ReactNativeHostT<ReactNativeHost, implementation::ReactNativeHost> {};
+
+} // namespace winrt::Microsoft::ReactNative::factory_implementation
diff --git a/vnext/Desktop/React.Windows.Desktop.vcxproj b/vnext/Desktop/React.Windows.Desktop.vcxproj
index 556cb33f4db..304f44e661b 100644
--- a/vnext/Desktop/React.Windows.Desktop.vcxproj
+++ b/vnext/Desktop/React.Windows.Desktop.vcxproj
@@ -90,6 +90,9 @@
       <AdditionalDependencies>Shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <AdditionalOptions>-minpdbpathlen:256</AdditionalOptions>
     </Link>
+    <Midl>
+      <AdditionalIncludeDirectories>$(ReactNativeWindowsDir)\Microsoft.ReactNative;$(ReactNativeWindowsDir)\Microsoft.ReactNative.Cxx;</AdditionalIncludeDirectories>
+    </Midl>
   </ItemDefinitionGroup>
   <Import Project="$(ReactNativeWindowsDir)\PropertySheets\ReactCommunity.cpp.props" />
   <ItemGroup>
@@ -97,6 +100,17 @@
     <Midl Include="ABI\MessageQueue.idl" />
     <Midl Include="ABI\NativeLogging.idl" />
     <Midl Include="ABI\NativeTracing.idl" />
+    <Midl Include="..\Microsoft.ReactNative\ReactNativeHost.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IReactPackageProvider.idl" />
+    <Midl Include="..\Microsoft.ReactNative\ReactInstanceSettings.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IReactPackageBuilder.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IReactModuleBuilder.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IJSValueWriter.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IReactContext.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IJSValueReader.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IViewManager.idl" />
+    <Midl Include="..\Microsoft.ReactNative\IReactPropertyBag.idl" />
+    <Midl Include="..\Microsoft.ReactNative\RedBoxHandler.idl" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="ABI\MemoryTracker.cpp">
@@ -115,6 +129,10 @@
       <DependentUpon>ABI\NativeTracing.idl</DependentUpon>
       <ObjectFileName>$(IntDir)\ABI\</ObjectFileName>
     </ClCompile>
+    <ClCompile Include="ABI\ReactNativeHost.cpp">
+      <DependentUpon>..\Microsoft.ReactNative\ReactNativeHost.idl</DependentUpon>
+      <ObjectFileName>$(IntDir)\ABI\</ObjectFileName>
+    </ClCompile>
     <ClCompile Include="CxxReactWin32\JSBigString.cpp" />
     <ClCompile Include="DevSupportManager.cpp" />
     <ClCompile Include="Executors\WebSocketJSExecutor.cpp" />
@@ -145,6 +163,10 @@
     <ClInclude Include="ABI\NativeTraceEventSource.h">
       <DependentUpon>ABI\NativeTracing.idl</DependentUpon>
     </ClInclude>
+    <ClInclude Include="ABI\ReactNativeHost.h">
+      <DependentUpon>..\Microsoft.ReactNative\ReactNativeHost.idl</DependentUpon>
+      <SubType>Code</SubType>
+    </ClInclude>
     <ClInclude Include="DevSupportManager.h" />
     <ClInclude Include="Executors\WebSocketJSExecutor.h" />
     <ClInclude Include="LazyDevSupportManager.h" />
diff --git a/vnext/Desktop/React.Windows.Desktop.vcxproj.filters b/vnext/Desktop/React.Windows.Desktop.vcxproj.filters
index e150e18d4fa..6a4be8c5886 100644
--- a/vnext/Desktop/React.Windows.Desktop.vcxproj.filters
+++ b/vnext/Desktop/React.Windows.Desktop.vcxproj.filters
@@ -42,6 +42,39 @@
     <Midl Include="ABI\NativeTracing.idl">
       <Filter>ABI</Filter>
     </Midl>
+    <Midl Include="..\Microsoft.ReactNative\ReactNativeHost.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IReactPackageProvider.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\ReactInstanceSettings.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IReactPackageBuilder.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IReactModuleBuilder.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IJSValueWriter.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IReactContext.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IJSValueReader.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IViewManager.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\IReactPropertyBag.idl">
+      <Filter>ABI</Filter>
+    </Midl>
+    <Midl Include="..\Microsoft.ReactNative\RedBoxHandler.idl">
+      <Filter>ABI</Filter>
+    </Midl>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="ABI\MemoryTracker.cpp">
diff --git a/vnext/Desktop/module.g.cpp b/vnext/Desktop/module.g.cpp
index 84d71805b03..a1ed4613ebe 100644
--- a/vnext/Desktop/module.g.cpp
+++ b/vnext/Desktop/module.g.cpp
@@ -1,8 +1,11 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
+// WARNING: Please don't edit this file. It was generated by C++/WinRT v2.0.200316.3
+
 #include "pch.h"
 #include "winrt/base.h"
+void* winrt_make_Microsoft_ReactNative_ReactNativeHost();
 void* winrt_make_facebook_react_MemoryTracker();
 void* winrt_make_facebook_react_NativeLogEventSource();
 void* winrt_make_facebook_react_NativeTraceEventSource();
@@ -25,6 +28,11 @@ void* __stdcall winrt_get_activation_factory([[maybe_unused]] std::wstring_view
         return std::equal(left.rbegin(), left.rend(), right.rbegin(), right.rend());
     };
 
+    if (requal(name, L"Microsoft.ReactNative.ReactNativeHost"))
+    {
+        return winrt_make_Microsoft_ReactNative_ReactNativeHost();
+    }
+
     if (requal(name, L"facebook.react.MemoryTracker"))
     {
         return winrt_make_facebook_react_MemoryTracker();