diff --git a/src/claimDefinitions/index.js b/src/claimDefinitions/index.js
index 49e8240..024224d 100644
--- a/src/claimDefinitions/index.js
+++ b/src/claimDefinitions/index.js
@@ -31,7 +31,8 @@ const list = [
   'mastodon',
   'pleroma',
   'discourse',
-  'owncast'
+  'owncast',
+  'stackexchange'
 ]
 
 const data = {
@@ -52,7 +53,8 @@ const data = {
   mastodon: require('./mastodon'),
   pleroma: require('./pleroma'),
   discourse: require('./discourse'),
-  owncast: require('./owncast')
+  owncast: require('./owncast'),
+  stackexchange: require('./stackexchange')
 }
 
 exports.list = list
diff --git a/src/claimDefinitions/stackexchange.js b/src/claimDefinitions/stackexchange.js
new file mode 100644
index 0000000..949314d
--- /dev/null
+++ b/src/claimDefinitions/stackexchange.js
@@ -0,0 +1,117 @@
+/*
+Copyright 2022 Yarmo Mackenbach
+
+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.
+*/
+const E = require('../enums')
+
+const reURI = /^https:\/\/(.*(?:askubuntu|mathoverflow|serverfault|stackapps|stackoverflow)|.+\.stackexchange)\.com\/users\/(\d+)/
+const reStackExchange = /\.stackexchange$/
+
+const processURI = (uri) => {
+  const [, domain, id] = uri.match(reURI)
+  const site = domain.replace(reStackExchange, '')
+
+  return {
+    serviceprovider: {
+      type: 'web',
+      name: 'stackexchange'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: false
+    },
+    profile: {
+      display: `${id}@${site}`,
+      uri: uri,
+      qr: null
+    },
+    proof: {
+      uri: `https://${domain}.com/users/${id}?tab=profile`,
+      request: {
+        fetcher: E.Fetcher.HTTP,
+        access: E.ProofAccess.GENERIC,
+        format: E.ProofFormat.JSON,
+        data: {
+          url: `https://api.stackexchange.com/2.3/users/${id}?site=${site}&filter=!AH)b5JqVyImf`,
+          format: E.ProofFormat.JSON
+        }
+      }
+    },
+    claim: {
+      format: E.ClaimFormat.MESSAGE,
+      relation: E.ClaimRelation.CONTAINS,
+      path: ['items', 'about_me']
+    }
+  }
+}
+
+const tests = [
+  {
+    uri: 'https://stackoverflow.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://stackoverflow.com/users/1234/alice',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://stackoverflow.com/users/1234?tab=topactivity',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://stackoverflow.com/users/1234/alice?tab=profile',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://meta.stackoverflow.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://pt.stackoverflow.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://pt.meta.stackoverflow.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://serverfault.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://meta.stackexchange.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://gaming.meta.stackexchange.com/users/1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://stackexchange.com/users/1234',
+    shouldMatch: false
+  },
+  {
+    uri: 'https://domain.com/users/1234',
+    shouldMatch: false
+  },
+  {
+    uri: 'https://meta.domain.com/users/1234',
+    shouldMatch: false
+  }
+
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests