diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 0000000..ef63aed
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,40 @@
+name: Benchmark
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions: {}
+
+env:
+  FORCE_COLOR: 1
+  PIP_DISABLE_PIP_VERSION_CHECK: 1
+
+jobs:
+  benchmarks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Python 3.14
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: "3.14"
+          allow-prereleases: true
+
+      - name: Install gettext
+        run: |
+          sudo apt install gettext
+
+      - name: Generate translation binaries
+        run: |
+          scripts/generate-translation-binaries.sh
+
+      - name: Install dependencies
+        run: pip install -e ".[tests]"
+
+      - name: Run benchmarks
+        uses: CodSpeedHQ/action@3194d9a39c4d46684cb44bf7207fc56626aad8fd # v4.15.1
+        with:
+          mode: simulation
+          run: pytest tests/test_benchmarks.py --codspeed
diff --git a/pyproject.toml b/pyproject.toml
index 5cbff14..07fe9a0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,8 @@ dynamic = [ "version" ]
 optional-dependencies.tests = [
   "freezegun",
   "pytest>=9",
+  "pytest-benchmark",
+  "pytest-codspeed",
   "pytest-cov",
 ]
 urls."Issue tracker" = "https://github.com/python-humanize/humanize/issues"
diff --git a/tests/test_benchmarks.py b/tests/test_benchmarks.py
new file mode 100644
index 0000000..c200dd0
--- /dev/null
+++ b/tests/test_benchmarks.py
@@ -0,0 +1,82 @@
+"""Benchmarks run via pytest-codspeed."""
+
+from __future__ import annotations
+
+import datetime as dt
+
+import pytest
+
+import humanize
+
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pytest_codspeed import BenchmarkFixture
+
+
+@pytest.fixture(scope="session", autouse=True)
+def _warmup_i18n() -> None:
+    # Touch i18n-backed functions once so lazy gettext catalog loading
+    # is not attributed to the first benchmarked call.
+    humanize.naturaltime(dt.datetime.now() - dt.timedelta(seconds=1))
+    humanize.naturalday(dt.date.today())
+
+
+def test_apnumber(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.apnumber, 7)
+
+
+def test_clamp(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.clamp, 0.5, "{:.0%}", 0.1, 0.9)
+
+
+def test_fractional(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.fractional, 1.5)
+
+
+def test_intcomma(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.intcomma, 1_234_567_890)
+
+
+def test_intword(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.intword, 1_234_567_890)
+
+
+def test_metric(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.metric, 1500, "W")
+
+
+def test_natural_list(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.natural_list, ["one", "two", "three", "four"])
+
+
+def test_naturaldate(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.naturaldate, dt.date.today() - dt.timedelta(days=30))
+
+
+def test_naturalday(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.naturalday, dt.date.today() - dt.timedelta(days=1))
+
+
+def test_naturaldelta(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.naturaldelta, dt.timedelta(hours=3, minutes=27))
+
+
+def test_naturalsize(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.naturalsize, 1_234_567_890)
+
+
+def test_naturaltime(benchmark: BenchmarkFixture) -> None:
+    when = dt.datetime.now() - dt.timedelta(hours=3, minutes=27)
+    benchmark(humanize.naturaltime, when)
+
+
+def test_ordinal(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.ordinal, 123)
+
+
+def test_precisedelta(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.precisedelta, dt.timedelta(days=2, hours=3, seconds=4))
+
+
+def test_scientific(benchmark: BenchmarkFixture) -> None:
+    benchmark(humanize.scientific, -1.234e-50)