diff --git a/.github/workflows/build-pnnx.yml b/.github/workflows/build-pnnx.yml
new file mode 100644
index 000000000000..11c82cb7f78e
--- /dev/null
+++ b/.github/workflows/build-pnnx.yml
@@ -0,0 +1,147 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `build`/`test` jobs of:
+# https://github.com/Tencent/ncnn/blob/master/.github/workflows/pnnx.yml
+name: Build pnnx wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pnnx.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pnnx.yml'
+      - 'docs/packages/pnnx.yaml'
+      - 'patches/pnnx/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pnnx.yml'
+      - 'docs/packages/pnnx.yaml'
+      - 'patches/pnnx/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+  # pnnx ships no sdist and no git tag; its PyPI version is the UTC build date
+  # (tools/pnnx/python/setup.py's set_version() is time.strftime("%Y%m%d")).
+  # Pinned to the last commit touching tools/pnnx or src/layer/* before the
+  # 20260526 release's upload_time_iso_8601 (2026-05-26T08:12Z).
+  PNNX_REF: b76824882e68d4a675c96e3f7e70d0104b2ff9c7
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: pnnx
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+    name: Build pnnx ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 180
+
+    env:
+      PNNX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout ncnn ${{ env.PNNX_REF }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: Tencent/ncnn
+          ref: ${{ env.PNNX_REF }}
+          sparse-checkout: |
+            tools/pnnx
+            LICENSE.txt
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Patch pnnx source
+        run: git apply python-wheels/patches/pnnx/${{ env.PNNX_VERSION }}/*.patch
+
+      # setuptools only auto-discovers LICENSE* next to setup.py; the repo's
+      # licence file lives three directories up (ncnn covers the whole tree).
+      - name: Stage the licence
+        run: cp LICENSE.txt tools/pnnx/python/LICENSE.txt
+
+      - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: tools/pnnx/python
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # pnnx links libtorch at build time (CMakeLists.txt's find_package(Torch
+          # REQUIRED), probed via `import torch` when no Torch_INSTALL_DIR is set);
+          # torch has no riscv64 wheel on public PyPI, only on our own registry.
+          CIBW_BEFORE_BUILD: "pip install --only-binary=:all: torch"
+          # The pnnx executable is non-PIE; keep its base above vm.mmap_min_addr once auditwheel's
+          # patchelf prepends a segment, or it dies silently at exec (gotcha 595).
+          CIBW_ENVIRONMENT: >-
+            CMAKE_BUILD_PARALLEL_LEVEL=8
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=torch
+            PNNX_VERSION=${{ env.PNNX_VERSION }}
+            LDFLAGS="-Wl,-Ttext-segment=0x200000"
+          # setup.py's CMakeBuild shells out to cmake, which re-probes `import
+          # torch` itself; an isolated build env would not see the torch
+          # CIBW_BEFORE_BUILD already installed.
+          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
+          # TorchVision and onnxruntime are optional (CMakeLists.txt's own
+          # find_package(... QUIET) / find_library() fall back to "without"
+          # when absent); neither has a build-ready riscv64 recipe here, so
+          # this wheel converts plain TorchScript graphs but skips ONNX
+          # import/export and torchvision-op fusion.
+          CIBW_TEST_SOURCES: tools/pnnx/python/tests
+          # The *_pnnx.py modules pnnx generates import numpy unconditionally.
+          CIBW_TEST_REQUIRES: pytest packaging numpy
+          CIBW_TEST_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=torch,numpy
+          CIBW_TEST_COMMAND: python -m pytest tools/pnnx/python/tests -v
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pnnx-${{ env.PNNX_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pnnx ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pnnx-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pnnx.yaml b/docs/packages/pnnx.yaml
new file mode 100644
index 000000000000..94d4959ff0f7
--- /dev/null
+++ b/docs/packages/pnnx.yaml
@@ -0,0 +1,5 @@
+package-name: pnnx
+source-code: https://github.com/Tencent/ncnn/tree/master/tools/pnnx
+license: BSD-3-Clause
+versions:
+- version: 20260526
diff --git a/patches/pnnx/20260526/0001-cmake-require-c-20-for-pytorch-2.13.patch b/patches/pnnx/20260526/0001-cmake-require-c-20-for-pytorch-2.13.patch
new file mode 100644
index 000000000000..18a110846ec2
--- /dev/null
+++ b/patches/pnnx/20260526/0001-cmake-require-c-20-for-pytorch-2.13.patch
@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Thu, 15 Oct 2026 03:21:35 +0000
+Subject: [PATCH] cmake: require c++20 for pytorch 2.13+
+
+Upstream already fixed this (nihui/ncnn@61ea75123d0ea71e4b029742664e3d49b7c8eec6,
+merged 2026-09-17), but this port pins pnnx at a commit from before that fix
+(2026-05-26, matching the 20260526 PyPI release date). The riscv64 torch wheels
+this repo publishes are 2.13.0+cpu and 2.14.0+cpu, both >= 2.13, so without this
+backport the build fails: ATen's headers at torch>=2.13 require a C++20
+compiler, and the unpatched CMakeLists.txt here only ever requests C++17.
+
+Upstream-Status: Backport [https://github.com/Tencent/ncnn/commit/61ea75123d0ea71e4b029742664e3d49b7c8eec6]
+---
+ tools/pnnx/CMakeLists.txt | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/tools/pnnx/CMakeLists.txt b/tools/pnnx/CMakeLists.txt
+index e50ab47..210eb73 100644
+--- a/tools/pnnx/CMakeLists.txt
++++ b/tools/pnnx/CMakeLists.txt
+@@ -59,7 +59,10 @@ if(Torch_VERSION VERSION_LESS "1.8")
+     message(FATAL_ERROR "pnnx only supports PyTorch >= 1.8")
+ endif()
+ 
+-if(Torch_VERSION VERSION_GREATER_EQUAL "2.1")
++if(Torch_VERSION VERSION_GREATER_EQUAL "2.13")
++    # c++20 is required for using torch 2.13+ headers
++    set(CMAKE_CXX_STANDARD 20)
++elseif(Torch_VERSION VERSION_GREATER_EQUAL "2.1")
+     # c++17 is required for using torch 2.1+ headers
+     set(CMAKE_CXX_STANDARD 17)
+ endif()
+-- 
+2.43.0
+
diff --git a/patches/pnnx/20260526/0002-setup-take-the-wheel-version-from-PNNX_VERSION.patch b/patches/pnnx/20260526/0002-setup-take-the-wheel-version-from-PNNX_VERSION.patch
new file mode 100644
index 000000000000..d7d798438205
--- /dev/null
+++ b/patches/pnnx/20260526/0002-setup-take-the-wheel-version-from-PNNX_VERSION.patch
@@ -0,0 +1,34 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Fri, 23 Oct 2026 23:50:00 +0000
+Subject: [PATCH] setup: take the wheel version from PNNX_VERSION
+
+setup.py stamps the wheel with the build date (time.strftime("%Y%m%d")),
+which is how upstream versions each release: the release workflow builds
+on the day it publishes. This port rebuilds an already-released version
+from the commit it was cut from, so the build date is the wrong version:
+CI run 38676705597 built pnnx-20261015 wheels for the 20260526 release,
+and jobs straddling midnight UTC would produce mixed versions that the
+publish step rejects. Let the workflow pass the release's version in
+PNNX_VERSION, falling back to the build date when it is unset.
+
+Upstream-Status: Inappropriate [riscv64 port rebuilds a past date-stamped release; upstream versions wheels by their build date]
+---
+ tools/pnnx/python/setup.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/tools/pnnx/python/setup.py b/tools/pnnx/python/setup.py
+index bb3ca546..73560f8a 100644
+--- a/tools/pnnx/python/setup.py
++++ b/tools/pnnx/python/setup.py
+@@ -10,7 +10,7 @@ from setuptools.command.build_ext import build_ext
+ from setuptools.command.install import install
+
+ def set_version():
+-    pnnx_version = time.strftime("%Y%m%d", time.localtime())
++    pnnx_version = os.environ.get("PNNX_VERSION") or time.strftime("%Y%m%d", time.localtime())
+     return pnnx_version
+
+ # Parse environment variables
+--
+2.43.0