diff --git a/src/claimDefinitions/index.js b/src/claimDefinitions/index.js
index 67268b6..479c7e6 100644
--- a/src/claimDefinitions/index.js
+++ b/src/claimDefinitions/index.js
@@ -34,7 +34,8 @@ const data = {
   activitypub: require('./activitypub'),
   discourse: require('./discourse'),
   owncast: require('./owncast'),
-  stackexchange: require('./stackexchange')
+  stackexchange: require('./stackexchange'),
+  keybase: require('./keybase')
 }
 
 exports.list = Object.keys(data)
diff --git a/src/claimDefinitions/keybase.js b/src/claimDefinitions/keybase.js
new file mode 100644
index 0000000..a313ffe
--- /dev/null
+++ b/src/claimDefinitions/keybase.js
@@ -0,0 +1,74 @@
+/*
+Copyright 2023 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:\/\/keybase.io\/(.*)\/?/
+
+const processURI = (uri) => {
+  const match = uri.match(reURI)
+
+  return {
+    serviceprovider: {
+      type: 'web',
+      name: 'keybase'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: false
+    },
+    profile: {
+      display: match[1],
+      uri: uri,
+      qr: null
+    },
+    proof: {
+      uri: `https://keybase.io/_/api/1.0/user/lookup.json?username=${match[1]}`,
+      request: {
+        fetcher: E.Fetcher.HTTP,
+        access: E.ProofAccess.NOCORS,
+        format: E.ProofFormat.JSON,
+        data: {
+          url: `https://keybase.io/_/api/1.0/user/lookup.json?username=${match[1]}`,
+          format: E.ProofFormat.JSON
+        }
+      }
+    },
+    claim: [{
+      format: E.ClaimFormat.FINGERPRINT,
+      relation: E.ClaimRelation.CONTAINS,
+      path: ['them', 'public_keys', 'primary', 'key_fingerprint']
+    }]
+  }
+}
+
+const tests = [
+  {
+    uri: 'https://keybase.io/Alice',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://keybase.io/Alice/',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/Alice',
+    shouldMatch: false
+  }
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests