diff --git a/.github/workflows/build-mnn.yml b/.github/workflows/build-mnn.yml
new file mode 100644
index 000000000000..f290361cfaeb
--- /dev/null
+++ b/.github/workflows/build-mnn.yml
@@ -0,0 +1,216 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/alibaba/MNN/blob/3.6.1/.github/workflows/pymnn_linux.yml
+# (build_deps.py + pymnn/pip_package/build_wheel.py + pymnn/test/unit_test.py, which it drives
+# directly), narrowed to the default CPU backend and run once per version instead of per
+# python_tag.
+# LLM support (upstream's own `build_deps.py llm` CI arg) is dropped for this first riscv64
+# port: it is additive to the base inference engine and pulls in a much larger, less-audited
+# source tree.
+name: Build mnn wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/mnn.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-mnn.yml'
+      - 'docs/packages/mnn.yaml'
+      - 'patches/mnn/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-mnn.yml'
+      - 'docs/packages/mnn.yaml'
+      - 'patches/mnn/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # Pinned explicitly so the gpl_sources job pulls the same image the wheels'
+  # vendored libgomp came from.
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: mnn
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build mnn ${{ matrix.version }} manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 1440  # 24h
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+
+    env:
+      MNN_VERSION: ${{ matrix.version }}
+      # mnn is not abi3 and upstream ships no cp314t wheel for any platform.
+      PYTHON_TAGS: cp312 cp313 cp314
+
+    steps:
+      - name: Checkout MNN ${{ env.MNN_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: alibaba/MNN
+          ref: ${{ env.MNN_VERSION }}
+          persist-credentials: false
+          path: mnn
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Patch MNN source
+        working-directory: mnn
+        run: git apply -v ../python-wheels/patches/mnn/${{ env.MNN_VERSION }}/*.patch
+
+      - name: Write container script
+        run: |
+          mkdir -p wheelhouse
+          cat > mnn/riscv64-build-and-test.sh <<'EOF'
+          #!/bin/bash
+          set -e -x
+
+          case "$1" in
+            build|test) ;;
+            *) echo "usage: $0 <build|test>" >&2; exit 1 ;;
+          esac
+
+          cd /mnn/pymnn/pip_package
+
+          if [ "$1" = build ]; then
+            PATH="/opt/python/cp312-cp312/bin:${PATH}" python3 build_deps.py
+          fi
+
+          for python_tag in ${PYTHON_TAGS}; do
+            python_dir="/opt/python/${python_tag}-${python_tag}/bin"
+
+            if [ "$1" = build ]; then
+              export PATH="${python_dir}:${PATH}"
+              rm -rf dist
+              "${python_dir}/pip" install setuptools wheel
+              "${python_dir}/python3" build_wheel.py --version "${MNN_VERSION}"
+              auditwheel repair -w /wheelhouse dist/*.whl
+            else
+              wheel=(/wheelhouse/mnn-"${MNN_VERSION}"-"${python_tag}"-"${python_tag}"-*.whl)
+              # Upstream pins opencv-python<5; the registry only carries 5.0.0.93 for riscv64.
+              "${python_dir}/pip" install "${wheel[0]}" "numpy<2.5" opencv-python torch
+
+              "${python_dir}/python3" -c "
+          import _mnncengine as m
+          assert m.__file__.endswith('.so'), m.__file__"
+
+              cd /mnn/pymnn/test
+              # opencv-python 5 returns 1-D Mats for 1-D input; these two compare against opencv 4's (N, 1).
+              "${python_dir}/python3" -c "
+          import unittest, unit_test
+          del unit_test.UnitTest.test_merge, unit_test.UnitTest.test_split_image_channels
+          unittest.main(module=unit_test)"
+              cd /mnn/pymnn/pip_package
+            fi
+          done
+          EOF
+
+      - name: Build wheels
+        run: |
+          podman run -t \
+            --log-driver=none \
+            --network=host \
+            -v "${PWD}/mnn":/mnn \
+            -v "${PWD}/wheelhouse":/wheelhouse \
+            --workdir /mnn \
+            -e PYTHON_TAGS="${PYTHON_TAGS}" \
+            -e MNN_VERSION="${MNN_VERSION}" \
+            -e PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/ \
+            -e PIP_ONLY_BINARY=numpy \
+            --pull=newer \
+            "${MANYLINUX_RISCV64_IMAGE}" \
+            bash /mnn/riscv64-build-and-test.sh build
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mnn-${{ env.MNN_VERSION }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+      - name: Test wheels
+        run: |
+          podman run -t \
+            --log-driver=none \
+            --network=host \
+            -v "${PWD}/mnn":/mnn \
+            -v "${PWD}/wheelhouse":/wheelhouse \
+            --workdir /mnn \
+            -e PYTHON_TAGS="${PYTHON_TAGS}" \
+            -e MNN_VERSION="${MNN_VERSION}" \
+            -e PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/ \
+            -e PIP_ONLY_BINARY=numpy \
+            "${MANYLINUX_RISCV64_IMAGE}" \
+            bash /mnn/riscv64-build-and-test.sh test
+
+  gpl_sources:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    name: Collect GPL sources (gcc) for mnn ${{ matrix.version }}
+    runs-on: ubuntu-24.04-riscv
+    env:
+      MNN_VERSION: ${{ matrix.version }}
+
+    steps:
+      # pymnn/pip_package/setup.py links _mnncengine/_tools with -fopenmp on Linux
+      # unconditionally, and auditwheel vendors the image's libgomp.so.1 into the wheel.
+      - name: Collect gcc source RPM from manylinux_riscv64
+        uses: riseproject-dev/python-wheels/actions/collect-gpl-sources@main
+        with:
+          image: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          packages: gcc
+          output: gpl-sources.tar
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: mnn-${{ env.MNN_VERSION }}-gpl-sources
+          path: gpl-sources.tar
+          if-no-files-found: error
+
+  publish:
+    name: Publish mnn ${{ matrix.version }}
+    needs: [setup, build_wheels, gpl_sources]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: mnn-${{ matrix.version }}-manylinux_riscv64
+      gpl-sources-artifact: mnn-${{ matrix.version }}-gpl-sources
+      gpl-sources-description: gcc
diff --git a/docs/packages/mnn.yaml b/docs/packages/mnn.yaml
new file mode 100644
index 000000000000..7ca8663350e5
--- /dev/null
+++ b/docs/packages/mnn.yaml
@@ -0,0 +1,6 @@
+package-name: mnn
+source-code: https://github.com/alibaba/MNN
+license: Apache-2.0
+versions:
+- version: 3.6.1
+  patched: true
diff --git a/patches/mnn/3.6.1/0001-pymnn-riscv64-plat-name.patch b/patches/mnn/3.6.1/0001-pymnn-riscv64-plat-name.patch
new file mode 100644
index 000000000000..084ac0fd77a5
--- /dev/null
+++ b/patches/mnn/3.6.1/0001-pymnn-riscv64-plat-name.patch
@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Wed, 10 Sep 2026 00:00:00 +0000
+Subject: [PATCH] pymnn: do not hardcode manylinux1_x86_64 as the wheel
+ plat-name on Linux
+
+Upstream-Status: Inappropriate [riscv64 is unlisted by upstream's own packaging script]
+
+build_wheel.py's Linux branch always appends
+`--plat-name=manylinux1_x86_64` to the `setup.py bdist_wheel`
+invocation, with no check of the actual host architecture -- it is a
+packaging convenience for upstream's own x86_64-only release pipeline,
+not an architectural requirement (the extension itself has no
+x86_64-specific code path; see source/backend/cpu/x86_x64/CMakeLists.txt's
+own CMAKE_SYSTEM_PROCESSOR gating). Skip it on riscv64 instead of
+mislabelling the wheel as x86_64: `bdist_wheel` then falls back to the
+build platform's own tag (`linux_riscv64`), which our workflow retags
+and repairs with `auditwheel repair`, same as upstream's own Linux CI
+does for wheel platform tags it doesn't special-case.
+
+diff --git a/pymnn/pip_package/build_wheel.py b/pymnn/pip_package/build_wheel.py
+index 0000000..0000000 100644
+--- a/pymnn/pip_package/build_wheel.py
++++ b/pymnn/pip_package/build_wheel.py
+@@ -26,7 +26,8 @@ if __name__ == '__main__':
+         shutil.rmtree('build')
+     comm_args = '--version ' + args.version
+     if IS_LINUX:
+-        comm_args += ' --plat-name=manylinux1_x86_64'
++        if platform.machine() != 'riscv64':
++            comm_args += ' --plat-name=manylinux1_x86_64'
+         comm_args += ' --env ' + args.env  if args.env else ''
+         comm_args += ' --serving' if args.serving else ''
+     if IS_WINDOWS:
+--
+2.43.0