diff --git a/.github/workflows/cifuzz.yml b/.github/workflows/cifuzz.yml
new file mode 100644
index 00000000..850541a0
--- /dev/null
+++ b/.github/workflows/cifuzz.yml
@@ -0,0 +1,36 @@
+name: CIFuzz
+on: [pull_request]
+permissions: {}
+jobs:
+ Fuzzing:
+   runs-on: ubuntu-latest
+   permissions:
+     security-events: write
+   steps:
+   - name: Build Fuzzers
+     id: build
+     uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+     with:
+       oss-fuzz-project-name: 'icalendar'
+       language: python
+   - name: Run Fuzzers
+     uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+     with:
+       oss-fuzz-project-name: 'icalendar'
+       language: python
+       fuzz-seconds: 600
+       output-sarif: true
+   - name: Upload Crash
+     uses: actions/upload-artifact@v3
+     if: failure() && steps.build.outcome == 'success'
+     with:
+       name: artifacts
+       path: ./out/artifacts
+   - name: Upload Sarif
+     if: always() && steps.build.outcome == 'success'
+     uses: github/codeql-action/upload-sarif@v2
+     with:
+      # Path to SARIF file relative to the root of the repository
+      sarif_file: cifuzz-sarif/results.sarif
+      checkout_path: cifuzz-sarif
+
diff --git a/CHANGES.rst b/CHANGES.rst
index d3816d2e..24e34ee9 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -16,6 +16,7 @@ Breaking changes:
 
 New features:
 
+- Added fuzzing harnesses, for integration to OSSFuzz.
 - icalendar releases are deployed to Github releases
   Fixes: #563
   [jacadzaca]
diff --git a/src/icalendar/fuzzing/build.sh b/src/icalendar/fuzzing/build.sh
new file mode 100755
index 00000000..09c317ce
--- /dev/null
+++ b/src/icalendar/fuzzing/build.sh
@@ -0,0 +1,25 @@
+#!/bin/bash -eu
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+cd "$SRC"/icalendar
+pip3 install .
+
+# Build fuzzers in $OUT
+for fuzzer in $(find $SRC -name 'src/icalendar/fuzzing/*_fuzzer.py');do
+  compile_python_fuzzer "$fuzzer" 
+done
+zip -q $OUT/ical_fuzzer_seed_corpus.zip $SRC/corpus/*
diff --git a/src/icalendar/fuzzing/ical_fuzzer.py b/src/icalendar/fuzzing/ical_fuzzer.py
new file mode 100644
index 00000000..d524920a
--- /dev/null
+++ b/src/icalendar/fuzzing/ical_fuzzer.py
@@ -0,0 +1,47 @@
+#!/usr/bin/python3
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+import atheris
+import sys
+
+with atheris.instrument_imports(include=['icalendar']):
+    from icalendar import Calendar
+
+
+def TestOneInput(data):
+    fdp = atheris.FuzzedDataProvider(data)
+    try:
+        b = fdp.ConsumeBool()
+
+        cal = Calendar.from_ical(fdp.ConsumeString(fdp.remaining_bytes()))
+
+        if b:
+            for event in cal.walk('VEVENT'):
+                event.to_ical().decode('utf-8')
+        else:
+            cal.to_ical()
+    except ValueError as e:
+        if "component" in str(e) or "parse" in str(e) or "Expected" in str(e):
+            return -1
+        raise e
+
+def main():
+    atheris.Setup(sys.argv, TestOneInput)
+    atheris.Fuzz()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/icalendar/tests/test_with_doctest.py b/src/icalendar/tests/test_with_doctest.py
index 652198c3..d536ff9c 100644
--- a/src/icalendar/tests/test_with_doctest.py
+++ b/src/icalendar/tests/test_with_doctest.py
@@ -21,7 +21,7 @@
 PYTHON_FILES = [
     os.path.join(dirpath, filename)
     for dirpath, dirnames, filenames in os.walk(ICALENDAR_PATH)
-    for filename in filenames if filename.lower().endswith(".py")
+    for filename in filenames if filename.lower().endswith(".py") and 'fuzzing' not in dirpath
 ]
 
 MODULE_NAMES = [