diff --git a/ports/onnx/fix-cmakelists.patch b/ports/onnx/fix-cmakelists.patch
new file mode 100644
index 00000000000000..e6c68370b27992
--- /dev/null
+++ b/ports/onnx/fix-cmakelists.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 628dcaa..300e4ea 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -111,8 +111,8 @@ endif()
+ # find_package Python has replaced PythonInterp and PythonLibs since cmake 3.12
+ # Use the following command in the future; now this is only compatible with the latest pybind11
+ # find_package(Python ${PY_VERSION} COMPONENTS Interpreter Development REQUIRED)
+-find_package(PythonInterp ${PY_VERSION} REQUIRED)
+-find_package(PythonLibs ${PY_VERSION})
++find_package(Python3 ${PY_VERSION} COMPONENTS Interpreter REQUIRED)
++set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
+ 
+ if(CMAKE_SYSTEM_NAME STREQUAL "AIX")
+   set(CMAKE_NO_SYSTEM_FROM_IMPORTED 1)
+@@ -422,6 +422,7 @@ target_link_libraries(onnx PUBLIC onnx_proto)
+ add_onnx_global_defines(onnx)
+ 
+ if(BUILD_ONNX_PYTHON)
++  find_package(Python3 ${PY_VERSION} COMPONENTS Development REQUIRED)
+   if("${PY_EXT_SUFFIX}" STREQUAL "")
+     if(MSVC)
+       set(PY_EXT_SUFFIX ".pyd")
+@@ -441,10 +442,13 @@ if(BUILD_ONNX_PYTHON)
+                              $<BUILD_INTERFACE:${ONNX_ROOT}>
+                              $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+                              $<INSTALL_INTERFACE:include>
+-                             ${PYTHON_INCLUDE_DIR})
+-
++                             ${Python3_INCLUDE_DIRS})
++  target_link_directories(onnx_cpp2py_export PRIVATE
++                          ${Python3_LIBRARY_DIRS})
++  target_link_libraries(onnx_cpp2py_export PRIVATE
++                        ${Python3_LIBRARIES})
+   # pybind11 is a header only lib
+-  find_package(pybind11 2.2)
++  find_package(pybind11 2.2 CONFIG REQUIRED)
+   if(pybind11_FOUND)
+     target_include_directories(onnx_cpp2py_export PUBLIC
+       ${pybind11_INCLUDE_DIRS})
+@@ -687,6 +691,27 @@ endif()
+ 
+ include(GNUInstallDirs)
+ 
++# install protobuf files
++install(FILES ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-data.proto
++              ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-data.proto3
++              ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-ml.proto
++              ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-ml.proto3
++              ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-operators-ml.proto
++              ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx-operators-ml.proto3
++        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/onnx
++)
++# install python files
++if(BUILD_ONNX_PYTHON)
++  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_data_pb.py
++                ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_data_pb2.py
++                ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_ml_pb2.py
++                ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_operators_ml_pb2.py
++                ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_operators_pb.py
++                ${CMAKE_CURRENT_BINARY_DIR}/onnx/onnx_pb.py
++          DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/onnx
++  )
++endif()
++
+ install(DIRECTORY ${ONNX_ROOT}/onnx
+         DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+         FILES_MATCHING
diff --git a/ports/onnx/portfile.cmake b/ports/onnx/portfile.cmake
new file mode 100644
index 00000000000000..1c565ab0d5f302
--- /dev/null
+++ b/ports/onnx/portfile.cmake
@@ -0,0 +1,98 @@
+# uwp: LOAD_LIBRARY_SEARCH_DEFAULT_DIRS undefined identifier
+vcpkg_fail_port_install(ON_TARGET "uwp")
+vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO onnx/onnx
+    REF v1.9.0
+    SHA512 a3eecc74ce4f22524603fb86367d21c87a143ba27eef93ef4bd2e2868c2cadeb724b84df58a429286e7824adebdeba7fa059095b7ab29df8dcea8777bd7f4101
+    PATCHES
+        fix-cmakelists.patch
+        wrap-onnxifi-targets.patch
+)
+
+if(VCPKG_TARGET_IS_WINDOWS)
+    string(COMPARE EQUAL "${VCPKG_CRT_LINKAGE}" "static" USE_STATIC_RUNTIME)
+    list(APPEND PLATFORM_OPTIONS
+        -DONNX_USE_MSVC_STATIC_RUNTIME=${USE_STATIC_RUNTIME}
+    )
+endif()
+
+# ONNX_USE_PROTOBUF_SHARED_LIBS: find the library and check its file extension
+find_library(PROTOBUF_LIBPATH NAMES protobuf PATHS ${CURRENT_INSTALLED_DIR}/bin ${CURRENT_INSTALLED_DIR}/lib REQUIRED)
+get_filename_component(PROTOBUF_LIBNAME ${PROTOBUF_LIBPATH} NAME)
+if(PROTOBUF_LIBNAME MATCHES ${CMAKE_SHARED_LIBRARY_SUFFIX})
+    set(USE_PROTOBUF_SHARED ON)
+else()
+    set(USE_PROTOBUF_SHARED OFF)
+endif()
+
+vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
+    FEATURES
+        pybind11 BUILD_ONNX_PYTHON
+)
+
+# Like protoc, python is required for codegen.
+vcpkg_find_acquire_program(PYTHON3)
+
+# PATH for .bat scripts can find 'python'
+get_filename_component(PYTHON_DIR ${PYTHON3} PATH)
+vcpkg_add_to_path(PREPEND ${PYTHON_DIR})
+
+if("pybind11" IN_LIST FEATURES)
+    # When BUILD_ONNX_PYTHON, we need Development component. Give a hint for FindPython3
+    list(APPEND FEATURE_OPTIONS
+        -DPython3_ROOT_DIR=${CURRENT_INSTALLED_DIR}
+    )
+endif()
+
+vcpkg_cmake_configure(
+    SOURCE_PATH "${SOURCE_PATH}"
+    OPTIONS
+        ${FEATURE_OPTIONS} ${PLATFORM_OPTIONS}
+        -DPython3_EXECUTABLE=${PYTHON3}
+        -DONNX_ML=ON
+        -DONNX_GEN_PB_TYPE_STUBS=ON
+        -DONNX_USE_PROTOBUF_SHARED_LIBS=${USE_PROTOBUF_SHARED}
+        -DONNX_USE_LITE_PROTO=OFF
+        -DONNXIFI_ENABLE_EXT=OFF
+        -DONNX_BUILD_TESTS=OFF
+        -DONNX_BUILD_BENCHMARKS=OFF
+)
+
+if("pybind11" IN_LIST FEATURES)
+    # This target is not in install/export
+    vcpkg_cmake_build(TARGET onnx_cpp2py_export)
+endif()
+vcpkg_cmake_install()
+vcpkg_cmake_config_fixup(CONFIG_PATH lib/cmake/ONNX)
+
+file(INSTALL "${SOURCE_PATH}/LICENSE" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)
+
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include"
+                    "${CURRENT_PACKAGES_DIR}/debug/share"
+                    # the others are empty
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/onnx_ml"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/onnx_data"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/onnx_operators_ml"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/onnx_cpp2py_export"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/backend"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/tools"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/test"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/bin"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/examples"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/frontend"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/controlflow"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/generator"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/logical"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/math"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/nn"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/object_detection"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/quantization"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/reduction"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/rnn"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/sequence"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/traditionalml"
+                    "${CURRENT_PACKAGES_DIR}/include/onnx/defs/training"
+)
diff --git a/ports/onnx/vcpkg.json b/ports/onnx/vcpkg.json
new file mode 100644
index 00000000000000..6f9ee73238067e
--- /dev/null
+++ b/ports/onnx/vcpkg.json
@@ -0,0 +1,34 @@
+{
+  "name": "onnx",
+  "version-semver": "1.9.0",
+  "description": "Open standard for machine learning interoperability",
+  "homepage": "https://onnx.ai",
+  "supports": "!uwp",
+  "dependencies": [
+    "protobuf",
+    {
+      "name": "protobuf",
+      "host": true
+    },
+    {
+      "name": "python3",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    }
+  ],
+  "features": {
+    "pybind11": {
+      "description": "Build Python binaries",
+      "dependencies": [
+        "pybind11"
+      ]
+    }
+  }
+}
diff --git a/ports/onnx/wrap-onnxifi-targets.patch b/ports/onnx/wrap-onnxifi-targets.patch
new file mode 100644
index 00000000000000..598edf6030b079
--- /dev/null
+++ b/ports/onnx/wrap-onnxifi-targets.patch
@@ -0,0 +1,44 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 300e4ea..155dd0d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -614,6 +614,7 @@ if(APPLE)
+   set_target_properties(onnx PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
+ endif()
+ 
++if(ONNXIFI_ENABLE_EXT)
+ # ---[ ONNX Interface for Framework Integratin (ONNXIFI)
+ add_library(onnxifi INTERFACE)
+ target_include_directories(onnxifi INTERFACE
+@@ -688,6 +689,7 @@ if(MSVC)
+                                          # lists from 'identifier2'
+                         )
+ endif()
++endif() # ONNXIFI_ENABLE_EXT
+ 
+ include(GNUInstallDirs)
+ 
+@@ -737,8 +739,14 @@ install(FILES
+ install(EXPORT ONNXTargets DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/ONNX")
+ install(TARGETS
+   onnx onnx_proto
+-  onnxifi onnxifi_dummy onnxifi_loader
+   EXPORT ONNXTargets DESTINATION ${CMAKE_INSTALL_LIBDIR})
++if(ONNXIFI_ENABLE_EXT)
++  install(TARGETS
++    onnxifi onnxifi_dummy onnxifi_loader
++    EXPORT ONNXTargets
++    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
++    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
++    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+ 
+ if(NOT ANDROID AND NOT IOS)
+   install(TARGETS onnxifi_wrapper
+@@ -748,6 +756,7 @@ endif()
+ if(ONNXIFI_DUMMY_BACKEND)
+   add_definitions(-DONNXIFI_DUMMY_BACKEND=1)
+ endif()
++endif() # ONNXIFI_ENABLE_EXT
+ 
+ if(ONNX_BUILD_TESTS)
+   include(${ONNX_ROOT}/cmake/unittest.cmake)
diff --git a/versions/baseline.json b/versions/baseline.json
index ae0396a56267b4..058ad0e261846f 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -4540,6 +4540,10 @@
       "baseline": "6.9.4",
       "port-version": 0
     },
+    "onnx": {
+      "baseline": "1.9.0",
+      "port-version": 0
+    },
     "onnxruntime-gpu": {
       "baseline": "1.5.1",
       "port-version": 0
diff --git a/versions/o-/onnx.json b/versions/o-/onnx.json
new file mode 100644
index 00000000000000..5f4fc6e16a5846
--- /dev/null
+++ b/versions/o-/onnx.json
@@ -0,0 +1,9 @@
+{
+  "versions": [
+    {
+      "git-tree": "b53c9c9e969928def925c57ea5ddcdfb09293693",
+      "version-semver": "1.9.0",
+      "port-version": 0
+    }
+  ]
+}