diff --git a/src/claimDefinitions/index.js b/src/claimDefinitions/index.js
index 87ac4f8..d31f3c2 100644
--- a/src/claimDefinitions/index.js
+++ b/src/claimDefinitions/index.js
@@ -21,6 +21,7 @@ const list = [
   'twitter',
   'reddit',
   'liberapay',
+  'lichess',
   'hackernews',
   'lobsters',
   'devto',
@@ -41,6 +42,7 @@ const data = {
   twitter: require('./twitter'),
   reddit: require('./reddit'),
   liberapay: require('./liberapay'),
+  lichess: require('./lichess'),
   hackernews: require('./hackernews'),
   lobsters: require('./lobsters'),
   devto: require('./devto'),
diff --git a/src/claimDefinitions/lichess.js b/src/claimDefinitions/lichess.js
new file mode 100644
index 0000000..992cfe1
--- /dev/null
+++ b/src/claimDefinitions/lichess.js
@@ -0,0 +1,74 @@
+/*
+Copyright 2021 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:\/\/lichess\.org\/@\/(.*)\/?/
+
+const processURI = (uri) => {
+  const match = uri.match(reURI)
+
+  return {
+    serviceprovider: {
+      type: 'web',
+      name: 'lichess'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: false
+    },
+    profile: {
+      display: match[1],
+      uri: uri,
+      qr: null
+    },
+    proof: {
+      uri: `https://lichess.org/api/user/${match[1]}`,
+      request: {
+        fetcher: E.Fetcher.HTTP,
+        access: E.ProofAccess.GENERIC,
+        format: E.ProofFormat.JSON,
+        data: {
+          url: `https://lichess.org/api/user/${match[1]}`,
+          format: E.ProofFormat.JSON
+        }
+      }
+    },
+    claim: {
+      format: E.ClaimFormat.FINGERPRINT,
+      relation: E.ClaimRelation.CONTAINS,
+      path: ['profile', 'links']
+    }
+  }
+}
+
+const tests = [
+  {
+    uri: 'https://lichess.org/@/Alice',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://lichess.org/@/Alice/',
+    shouldMatch: true
+  },
+  {
+    uri: 'https://domain.org/@/Alice',
+    shouldMatch: false
+  }
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests