diff --git a/.github/workflows/pull.yml b/.github/workflows/pull.yml
index 26bd4bffd38..14504a853ed 100644
--- a/.github/workflows/pull.yml
+++ b/.github/workflows/pull.yml
@@ -51,7 +51,7 @@ jobs:
         bash .ci/scripts/test.sh
 
         # Test custom ops
-        bash examples/custom_ops/test_custom_ops.sh buck2
+        PYTHON_EXECUTABLE=python bash examples/custom_ops/test_custom_ops.sh buck2
         popd
 
   cmake-build-test-linux:
@@ -90,5 +90,5 @@ jobs:
         bash .ci/scripts/setup-macos.sh
 
         # Build and test custom ops
-        bash examples/custom_ops/test_custom_ops.sh cmake
+        PYTHON_EXECUTABLE=python bash examples/custom_ops/test_custom_ops.sh cmake
         popd
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23c980e7160..825417de7a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,6 +62,9 @@ endif()
 if(NOT BUCK2)
   set(BUCK2 buck2)
 endif()
+if(NOT PYTHON_EXECUTABLE)
+  set(PYTHON_EXECUTABLE python3)
+endif()
 
 # TODO(dbort): Fix these warnings and remove this flag.
 set(_common_compile_options -Wno-deprecated-declarations)
@@ -87,7 +90,7 @@ if(NOT EXECUTORCH_SRCS_FILE)
   message(STATUS "executorch: Generating source lists")
   set(EXECUTORCH_SRCS_FILE "${CMAKE_CURRENT_BINARY_DIR}/executorch_srcs.cmake")
   execute_process(
-    COMMAND python3 build/extract_sources.py --buck2=${BUCK2}
+    COMMAND ${PYTHON_EXECUTABLE} build/extract_sources.py --buck2=${BUCK2}
             --config=build/cmake_deps.toml --out=${EXECUTORCH_SRCS_FILE}
     OUTPUT_VARIABLE gen_srcs_output
     ERROR_VARIABLE gen_srcs_error
diff --git a/examples/custom_ops/test_custom_ops.sh b/examples/custom_ops/test_custom_ops.sh
index 34c7f8c5f55..67859da7174 100644
--- a/examples/custom_ops/test_custom_ops.sh
+++ b/examples/custom_ops/test_custom_ops.sh
@@ -14,7 +14,7 @@ set -e
 test_buck2_custom_op_1() {
   local model_name='custom_ops_1'
   echo "Exporting ${model_name}.pte"
-  python -m "examples.custom_ops.${model_name}"
+  ${PYTHON_EXECUTABLE} -m "examples.custom_ops.${model_name}"
   # should save file custom_ops_1.pte
 
   echo 'Running executor_runner'
@@ -29,12 +29,14 @@ test_buck2_custom_op_1() {
 test_cmake_custom_op_1() {
   local model_name='custom_ops_1'
   echo "Exporting ${model_name}.pte"
-  python -m "examples.custom_ops.${model_name}"
+  ${PYTHON_EXECUTABLE} -m "examples.custom_ops.${model_name}"
   # should save file custom_ops_1.pte
   (rm -rf cmake-out \
     && mkdir cmake-out \
     && cd cmake-out \
-    && cmake -DBUCK2=buck2 -DREGISTER_EXAMPLE_CUSTOM_OP_1=ON ..)
+    && cmake -DBUCK2=buck2 \
+        -DREGISTER_EXAMPLE_CUSTOM_OP_1=ON \
+        -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" ..)
 
   echo 'Building executor_runner'
   cmake --build cmake-out -j9
@@ -50,7 +52,7 @@ test_buck2_custom_op_2() {
   SO_LIB=$(buck2 build //examples/custom_ops:custom_ops_aot_lib_2 --show-output | grep "buck-out" | cut -d" " -f2)
 
   echo "Exporting ${model_name}.pte"
-  python -m "examples.custom_ops.${model_name}" --so_library="$SO_LIB"
+  ${PYTHON_EXECUTABLE} -m "examples.custom_ops.${model_name}" --so_library="$SO_LIB"
   # should save file custom_ops_2.pte
 
   buck2 run //examples/executor_runner:executor_runner \
@@ -77,7 +79,7 @@ get_shared_lib_ext() {
 
 test_cmake_custom_op_2() {
   local model_name='custom_ops_2'
-  SITE_PACKAGES="$(python -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())')"
+  SITE_PACKAGES="$(${PYTHON_EXECUTABLE} -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())')"
   CMAKE_PREFIX_PATH="${SITE_PACKAGES}/torch"
 
   (rm -rf cmake-out \
@@ -85,20 +87,25 @@ test_cmake_custom_op_2() {
     && cd cmake-out \
     && cmake -DBUCK2=buck2 \
       -DREGISTER_EXAMPLE_CUSTOM_OP_2=ON \
-      -DCMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH" ..)
+      -DCMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH" \
+      -DPYTHON_EXECUTABLE="$PYTHON_EXECUTABLE" ..)
 
   echo 'Building executor_runner'
   cmake --build cmake-out -j4
 
   EXT=$(get_shared_lib_ext)
   echo "Exporting ${model_name}.pte"
-  python -m "examples.custom_ops.${model_name}" --so_library="cmake-out/examples/custom_ops/libcustom_ops_aot_lib$EXT"
+  ${PYTHON_EXECUTABLE} -m "examples.custom_ops.${model_name}" --so_library="cmake-out/examples/custom_ops/libcustom_ops_aot_lib$EXT"
   # should save file custom_ops_2.pte
 
   echo 'Running executor_runner'
   cmake-out/executor_runner "--model_path=./${model_name}.pte"
 }
 
+if [[ -z $PYTHON_EXECUTABLE ]];
+then
+  PYTHON_EXECUTABLE=python3
+fi
 if [[ $1 == "cmake" ]];
 then
   test_cmake_custom_op_1
diff --git a/third-party/link_torch.sh b/third-party/link_torch.sh
index 63bd25f2864..d5c740bfa49 100644
--- a/third-party/link_torch.sh
+++ b/third-party/link_torch.sh
@@ -33,7 +33,7 @@ while getopts ":o:f:" opt; do
   esac
 done
 
-LIB=$(python3 -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())')
+LIB=$(python -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())')
 
 # delimiter ,
 export IFS=","