diff --git a/.github/workflows/build-pyjpegls.yml b/.github/workflows/build-pyjpegls.yml
new file mode 100644
index 000000000000..370461d43d1e
--- /dev/null
+++ b/.github/workflows/build-pyjpegls.yml
@@ -0,0 +1,131 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on upstream's own cibuildwheel-driven
+# https://github.com/pydicom/pyjpegls/blob/v1.5.1/.github/workflows/release-wheels.yml,
+# narrowed to Linux riscv64, with the tests of its pr-tests.yml.
+name: Build pyjpegls wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pyjpegls.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pyjpegls.yml'
+      - 'docs/packages/pyjpegls.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pyjpegls.yml'
+      - 'docs/packages/pyjpegls.yaml'
+
+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
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: pyjpegls
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build pyjpegls ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        # Mirrors upstream's own pr-tests.yml/release-wheels.yml matrix
+        # (3.9-3.13). Upstream ships no cp314 or cp314t wheel, has no
+        # free-threaded CI env, and the Cython extension declares no
+        # Py_mod_gil slot, so both are left out rather than shipped
+        # untested (gotcha 33/127).
+        python: ["cp39", "cp310", "cp311", "cp312", "cp313"]
+
+    env:
+      PYJPEGLS_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout pyjpegls v${{ env.PYJPEGLS_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: pydicom/pyjpegls
+          ref: v${{ env.PYJPEGLS_VERSION }}
+          submodules: true
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      # The extension compiles in the vendored CharLS (BSD-3-Clause) but the
+      # wheel ships no licence at all, for either project.
+      - name: Patch pyjpegls source
+        run: |
+          git apply python-wheels/patches/pyjpegls/${{ env.PYJPEGLS_VERSION }}/00*.patch
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=numpy
+          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_COMMAND: pytest --pyargs jpeg_ls.tests
+
+      - name: Check the wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          for whl in sys.argv[1:]:
+              names = zipfile.ZipFile(whl).namelist()
+              assert any(n.startswith("_CharLS") and n.endswith(".so") for n in names), whl
+              for lic in ("LICENSE", "LICENSE.charls"):
+                  assert any(n.endswith(".dist-info/licenses/" + lic) for n in names), (whl, lic)
+              print(whl, "ok")
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pyjpegls-${{ env.PYJPEGLS_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pyjpegls ${{ 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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pyjpegls-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pyjpegls.yaml b/docs/packages/pyjpegls.yaml
new file mode 100644
index 000000000000..1d62c003f37a
--- /dev/null
+++ b/docs/packages/pyjpegls.yaml
@@ -0,0 +1,5 @@
+package-name: pyjpegls
+source-code: https://github.com/pydicom/pyjpegls
+license: MIT
+versions:
+- version: 1.5.1
diff --git a/patches/pyjpegls/1.5.1/0001-package-the-CharLS-and-pyjpegls-licences-in-the-built-wheel.patch b/patches/pyjpegls/1.5.1/0001-package-the-CharLS-and-pyjpegls-licences-in-the-built-wheel.patch
new file mode 100644
index 000000000000..d886dbdafb4d
--- /dev/null
+++ b/patches/pyjpegls/1.5.1/0001-package-the-CharLS-and-pyjpegls-licences-in-the-built-wheel.patch
@@ -0,0 +1,98 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 13 Oct 2026 12:00:00 +0200
+Subject: [PATCH] package the CharLS and pyjpegls licences in the built wheel
+
+Upstream-Status: To upstream [not yet submitted; every pyjpegls wheel on PyPI has the same gap, so it needs a maintainer discussion rather than a drive-by PR]
+
+setup.py compiles lib/charls/src/*.cpp (CharLS, vendored by the
+team-charls/charls submodule pinned at v2.4.2) straight into the
+_CharLS extension, so every wheel redistributes CharLS in binary form.
+Its BSD-3-Clause licence requires the copyright notice to travel with
+the binary, but the repository's only licence text is license.txt
+(lowercase), which carries pyjpegls's own MIT text and nothing for
+CharLS.
+
+Worse, setuptools' default license-files auto-discovery glob
+(LICENSE*/LICENCE*/COPYING*/NOTICE*/AUTHORS*) is case-sensitive on
+Linux and never matches license.txt, so the built wheel ships no
+licence at all, for either project.
+
+Add LICENSE as an uppercase copy of the existing license.txt (MIT,
+verbatim) and LICENSE.charls with the vendored copy's licence text
+(BSD-3-Clause, verbatim from team-charls/charls's LICENSE.md) at the
+project root: setuptools' default glob then picks up both and copies
+them into the wheel's dist-info/licenses/, so no pyproject.toml change
+is needed.
+---
+ LICENSE        | 23 +++++++++++++++++++++++
+ LICENSE.charls | 28 ++++++++++++++++++++++++++++
+ 2 files changed, 51 insertions(+)
+ create mode 100644 LICENSE
+ create mode 100644 LICENSE.charls
+
+diff --git a/LICENSE b/LICENSE
+new file mode 100644
+index 0000000..03de66a
+--- /dev/null
++++ b/LICENSE
+@@ -0,0 +1,23 @@
++
++pyjpegls - JPEG-LS for Python via CharLS C++ Library
++
++The MIT License (MIT)
++
++Copyright (c) 2013 Pierre V. Villeneuve, pierre.villeneuve@gmail.com
++
++Permission is hereby granted, free of charge, to any person obtaining a copy of
++this software and associated documentation files (the "Software"), to deal in
++the Software without restriction, including without limitation the rights to
++use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
++the Software, and to permit persons to whom the Software is furnished to do so,
++subject to the following conditions:
++
++The above copyright notice and this permission notice shall be included in all
++copies or substantial portions of the Software.
++
++THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
++FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
++COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
++IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
++CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+diff --git a/LICENSE.charls b/LICENSE.charls
+new file mode 100644
+index 0000000..bbd8e6c
+--- /dev/null
++++ b/LICENSE.charls
+@@ -0,0 +1,28 @@
++CharLS
++Copyright (c) 2007, Jan de Vaan and Victor Derks
++All rights reserved.
++
++Redistribution and use in source and binary forms, with or without
++modification, are permitted provided that the following conditions are met:
++
++1. Redistributions of source code must retain the above copyright notice, this
++   list of conditions and the following disclaimer.
++
++2. Redistributions in binary form must reproduce the above copyright notice,
++   this list of conditions and the following disclaimer in the documentation
++   and/or other materials provided with the distribution.
++
++3. Neither the name of the copyright holder nor the names of its
++   contributors may be used to endorse or promote products derived from
++   this software without specific prior written permission.
++
++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
++AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
++IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
++DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
++FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
++DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
++SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
++CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
++OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
++OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+--
+2.43.0