diff --git a/.github/workflows/build_and_publish_template.yml b/.github/workflows/build_and_publish_template.yml
index ba46a5a63..e2731cdaf 100644
--- a/.github/workflows/build_and_publish_template.yml
+++ b/.github/workflows/build_and_publish_template.yml
@@ -33,7 +33,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.11", "3.12", "3.13", "3.14", "3.14t"]
         os: [ubuntu-22.04, ubuntu-22.04-arm, macos-14, windows-2022]
         is-ci-tests:
           - ${{ inputs.is_ci_tests }}
@@ -48,6 +48,8 @@ jobs:
             os: windows-2022
           - python-version: "3.14"
             os: ubuntu-22.04-arm
+          - python-version: "3.14t"
+            os: ubuntu-22.04
 
     env:
       USE_BAZEL_VERSION: "7.2.1"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3b3fcccc..53c2f5cff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ changes. Best viewed [here](https://google-grain.readthedocs.io/en/latest/change
 * New features:
   * Adds automated batching into shared memory when multiprocess prefetch is
     used to save one data copy.
+  * Add Python 3.14 free threaded build.
 
 * Breaking changes:
 
diff --git a/grain/oss/Dockerfile b/grain/oss/Dockerfile
index fd65009d6..acc4850b9 100644
--- a/grain/oss/Dockerfile
+++ b/grain/oss/Dockerfile
@@ -7,13 +7,14 @@ FROM quay.io/pypa/${AUDITWHEEL_PLATFORM}
 LABEL maintainer="Grain team <grain-dev@google.com>"
 
 ARG PYTHON_VERSION
+ARG PYTHON_BASE_VERSION
 ARG BAZEL_VERSION
 
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN ulimit -n 1024 && yum install -y rsync
 
-ENV PYTHON_BIN_PATH=/opt/python/cp${PYTHON_VERSION}-cp${PYTHON_VERSION}/bin
+ENV PYTHON_BIN_PATH=/opt/python/cp${PYTHON_BASE_VERSION}-cp${PYTHON_VERSION}/bin
 ENV PATH="${PYTHON_BIN_PATH}:${PATH}"
 
 ENV PYTHON_BIN=${PYTHON_BIN_PATH}/python
diff --git a/grain/oss/build_whl.sh b/grain/oss/build_whl.sh
index 4d3f78e52..cef050907 100644
--- a/grain/oss/build_whl.sh
+++ b/grain/oss/build_whl.sh
@@ -32,7 +32,17 @@ main() {
   write_to_bazelrc "build:macos --action_env=CC=clang"
   write_to_bazelrc "build:macos --action_env=CXX=clang++"
 
-  write_to_bazelrc "build --@rules_python//python/config_settings:python_version=${PYTHON_VERSION}"
+  BAZEL_PYTHON_VERSION="${PYTHON_VERSION}"
+  case "${PYTHON_VERSION}" in
+    *t)
+      BAZEL_PYTHON_VERSION="${PYTHON_VERSION%t}"
+      write_to_bazelrc "build --@rules_python//python/config_settings:py_freethreaded=yes"
+      write_to_bazelrc "test --@rules_python//python/config_settings:py_freethreaded=yes"
+      write_to_bazelrc "test --test_env=PYTHON_GIL=0"
+      ;;
+  esac
+
+  write_to_bazelrc "build --@rules_python//python/config_settings:python_version=${BAZEL_PYTHON_VERSION}"
   # Set platform-wise file extension for extension modules.
   case "$(uname)" in
     CYGWIN*|MINGW*|MSYS_NT*)
@@ -47,7 +57,7 @@ main() {
       ;;
   esac
 
-  write_to_bazelrc "test --@rules_python//python/config_settings:python_version=${PYTHON_VERSION}"
+  write_to_bazelrc "test --@rules_python//python/config_settings:python_version=${BAZEL_PYTHON_VERSION}"
   write_to_bazelrc "test --action_env PYTHON_VERSION=${PYTHON_VERSION}"
   write_to_bazelrc "test --test_timeout=300"
 
diff --git a/grain/oss/runner_common.sh b/grain/oss/runner_common.sh
index bfa73df15..8c0048bbd 100644
--- a/grain/oss/runner_common.sh
+++ b/grain/oss/runner_common.sh
@@ -32,9 +32,11 @@ build_and_test_grain() {
       AUDITWHEEL_PLATFORM='manylinux_2_28_'"$(uname -m)"
       docker rmi -f grain:${PYTHON_VERSION}
       docker rm -f grain
+      PYTHON_BASE_VERSION="${PYTHON_MAJOR_VERSION}${PYTHON_MINOR_VERSION%t}"
       DOCKER_BUILDKIT=1 docker build --progress=plain --no-cache \
         --build-arg AUDITWHEEL_PLATFORM="${AUDITWHEEL_PLATFORM}" \
         --build-arg PYTHON_VERSION="${PYTHON_MAJOR_VERSION}""${PYTHON_MINOR_VERSION}" \
+        --build-arg PYTHON_BASE_VERSION="${PYTHON_BASE_VERSION}" \
         --build-arg BAZEL_VERSION="${BAZEL_VERSION}" \
         -t grain:"${PYTHON_VERSION}" "${SOURCE_DIR}"'/grain/oss'