diff --git a/.gitmodules b/.gitmodules
index fe72100d..5f2147c2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -150,3 +150,6 @@
 [submodule "wallet-core"]
 	path = wallet-core
 	url = ../wallet-core.git
+[submodule "MNN"]
+	path = MNN
+	url = https://github.com/FedML-AI/MNN.git
diff --git a/MNN b/MNN
new file mode 160000
index 00000000..531facc6
--- /dev/null
+++ b/MNN
@@ -0,0 +1 @@
+Subproject commit 531facc6ada73323463711443878de1ec60a63d5
diff --git a/build/CommonTargets.CMake b/build/CommonTargets.CMake
index b6834818..385efcea 100644
--- a/build/CommonTargets.CMake
+++ b/build/CommonTargets.CMake
@@ -545,6 +545,16 @@ ExternalProject_Add(xxhash
           ${_CMAKE_COMMON_BUILD_PARAMS}
 )
 
+# --------------------------------------------------------
+# Builds MNN
+ExternalProject_Add(MNN
+  PREFIX MNN
+  SOURCE_DIR "${THIRDPARTY_DIR}/MNN"
+  CMAKE_CACHE_ARGS
+        -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_CURRENT_BINARY_DIR}/MNN
+        ${_CMAKE_COMMON_BUILD_PARAMS}
+)
+
 #ExternalProject_Add(wallet-core
 #    PREFIX wallet-core
 #    SOURCE_DIR "${THIRDPARTY_DIR}/wallet-core"