diff --git a/ports/klein/find_simde_first.patch b/ports/klein/find_simde_first.patch
new file mode 100644
index 00000000000..ab9f715c6bd
--- /dev/null
+++ b/ports/klein/find_simde_first.patch
@@ -0,0 +1,23 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c5d6f3f..a3ba161 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -29,16 +29,7 @@ endif()
+ option(KLEIN_BUILD_SYM "Enable compilation of symbolic Klein utility" ON)
+ option(KLEIN_BUILD_C_BINDINGS "Enable compilation of the Klein C bindings" ON)
+ 
+-include(FetchContent)
+-FetchContent_Declare(
+-    simde
+-    GIT_REPOSITORY https://github.com/simd-everywhere/simde
+-    GIT_TAG v0.7.2
+-    GIT_SHALLOW ON
+-)
+-FetchContent_GetProperties(simde)
+-if(NOT simde_POPULATED)
+-    FetchContent_Populate(simde)
+-endif()
++find_path(SIMDE_INCLUDE_DIR "simde/x86/sse4.1.h" REQUIRED)
++set(simde_SOURCE_DIR ${SIMDE_INCLUDE_DIR}/simde)
+ 
+ # The default platform and instruction set is x86 SSE3
diff --git a/ports/klein/portfile.cmake b/ports/klein/portfile.cmake
new file mode 100644
index 00000000000..aea4b100a3b
--- /dev/null
+++ b/ports/klein/portfile.cmake
@@ -0,0 +1,29 @@
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO jeremyong/klein
+    REF 92023c6a946af84e716deb1488cad22048d3e08d
+    SHA512 5d12ae143f07173992a6f9aa90539c4cb6c895a7169e5c086a10f78a31f7b2c9d64faf5ce1db014bd3badd92d24ff612dd2d2dc2f7508baac59307e3dccb6ebe
+    HEAD_REF master
+    PATCHES
+        "find_simde_first.patch"
+)
+
+vcpkg_cmake_configure(
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        -DKLEIN_ENABLE_PERF=OFF
+        -DKLEIN_ENABLE_TESTS=OFF
+        -DKLEIN_VALIDATE=OFF
+        -DKLEIN_BUILD_SYM=OFF
+        -DKLEIN_BUILD_C_BINDINGS=OFF
+        -DKLEIN_INSTALL=ON
+)
+
+vcpkg_cmake_install()
+vcpkg_fixup_pkgconfig()
+
+file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)
+file(INSTALL ${CMAKE_CURRENT_LIST_DIR}/usage DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT})
+
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug")
+
diff --git a/ports/klein/usage b/ports/klein/usage
new file mode 100644
index 00000000000..63658e26e8b
--- /dev/null
+++ b/ports/klein/usage
@@ -0,0 +1,10 @@
+The package klein:x64-windows provides CMake targets:
+
+    find_package(klein CONFIG REQUIRED)
+    target_link_libraries(main PRIVATE klein::klein)
+
+    # Or use the C++ 11 version
+    target_link_libraries(main PRIVATE klein::klein_cxx11)
+
+    # Or use the SSE4.1 version
+    target_link_libraries(main PRIVATE klein::klein_sse42)
diff --git a/ports/klein/vcpkg.json b/ports/klein/vcpkg.json
new file mode 100644
index 00000000000..9b6393b3bc6
--- /dev/null
+++ b/ports/klein/vcpkg.json
@@ -0,0 +1,16 @@
+{
+  "name": "klein",
+  "version-date": "2021-05-09",
+  "description": "Klein is an implementation of P(R*_{3, 0, 1}), aka 3D Projective Geometric Algebra. It is designed for applications that demand high-throughput (animation libraries, kinematic solvers, etc).",
+  "dependencies": [
+    "simde",
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    }
+  ]
+}
diff --git a/versions/baseline.json b/versions/baseline.json
index a200b7aee88..9cbe756ae00 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -2920,6 +2920,10 @@
       "baseline": "2020-03-30",
       "port-version": 0
     },
+    "klein": {
+      "baseline": "2021-05-09",
+      "port-version": 0
+    },
     "knet": {
       "baseline": "1.0.2",
       "port-version": 0
diff --git a/versions/k-/klein.json b/versions/k-/klein.json
new file mode 100644
index 00000000000..37c6367090e
--- /dev/null
+++ b/versions/k-/klein.json
@@ -0,0 +1,9 @@
+{
+  "versions": [
+    {
+      "git-tree": "5a367eafd82860f61245c54f64306b35a9e0978c",
+      "version-date": "2021-05-09",
+      "port-version": 0
+    }
+  ]
+}