diff --git a/.github/workflows/build-accelerator-toolbox.yml b/.github/workflows/build-accelerator-toolbox.yml
new file mode 100644
index 000000000000..a30477aa72a6
--- /dev/null
+++ b/.github/workflows/build-accelerator-toolbox.yml
@@ -0,0 +1,133 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/atcollab/at/blob/pyat-0.8.0/.github/workflows/build-python-wheels.yml
+name: Build accelerator-toolbox wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/accelerator-toolbox.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-accelerator-toolbox.yml'
+      - 'docs/packages/accelerator-toolbox.yaml'
+      - 'patches/accelerator-toolbox/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-accelerator-toolbox.yml'
+      - 'docs/packages/accelerator-toolbox.yaml'
+      - 'patches/accelerator-toolbox/**'
+
+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: accelerator-toolbox
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build accelerator-toolbox ${{ 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) }}
+        # Per-interpreter (not abi3): the C extensions link the version-specific ABI.
+        # cp38/cp39 and free-threaded builds excluded: upstream's own cibuildwheel
+        # config skips cp3{8,9}-* and cp*t-*. cp310/cp311 dropped too: h5py (a hard
+        # runtime dependency) has no riscv64 wheel for either interpreter on PyPI or
+        # on our own registry (docs/packages/h5py.yaml starts at cp312).
+        python:
+          - "cp312"
+          - "cp313"
+          - "cp314"
+
+    env:
+      ACCELERATOR_TOOLBOX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout accelerator-toolbox pyat-${{ env.ACCELERATOR_TOOLBOX_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: atcollab/at
+          ref: pyat-${{ env.ACCELERATOR_TOOLBOX_VERSION }}
+          fetch-depth: 0  # setuptools_scm derives the version from `git describe --tags`
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # numpy is a build-time requirement (pyproject.toml build-system.requires);
+          # scipy/h5py are runtime deps pulled in when cibuildwheel installs the
+          # wheel for the test step. Only our registry has any of these for
+          # riscv64; only-binary keeps a newer PyPI release from winning the
+          # resolution and then compiling from sdist (h5py would need libhdf5-dev).
+          CIBW_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=numpy,scipy,h5py
+          CIBW_TEST_SOURCES: pyat/test
+          CIBW_TEST_REQUIRES: pytest
+          # test_long_arrays_in_m_file reads machine_data/kickmap_w150_20mm.txt, which
+          # pyproject.toml's package-data glob (*.m, *.mat only) never ships in any
+          # installed wheel -- reproduced against a local x86_64 build, unrelated to riscv64.
+          CIBW_TEST_COMMAND: python -m pytest pyat/test -k "not test_long_arrays_in_m_file"
+
+      - name: Check wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          names = zipfile.ZipFile(sys.argv[1]).namelist()
+          exts = {n.split("/")[-1].split(".")[0] for n in names if n.endswith(".so")}
+          assert "atpass" in exts, exts
+          assert "cconfig" in exts, exts
+          assert any(n.startswith("DriftPass") for n in exts), exts
+          licences = {n.rsplit("/", 1)[-1] for n in names if ".dist-info/licenses/" in n} - {""}
+          assert licences == {"LICENSE"}, licences
+          EOF
+
+      - name: Store wheels
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: accelerator-toolbox-${{ env.ACCELERATOR_TOOLBOX_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish accelerator-toolbox ${{ 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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: accelerator-toolbox-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/accelerator-toolbox.yaml b/docs/packages/accelerator-toolbox.yaml
new file mode 100644
index 000000000000..09a37940d5c6
--- /dev/null
+++ b/docs/packages/accelerator-toolbox.yaml
@@ -0,0 +1,5 @@
+package-name: accelerator-toolbox
+source-code: https://github.com/atcollab/at
+license: Apache-2.0
+versions:
+- version: 0.8.0