diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e220ae..1cd4195 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,3 +27,4 @@
 - Implement `xsd:gMonthDay` codec and data type
 - Implement `xsd:duration` codec and data type
 - Implement `xsd:datetime` codec and data type
+- Implement `xsd:anyUri` codec
\ No newline at end of file
diff --git a/README.md b/README.md
index 57e17e5..71a2bc4 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ This library aims to support the following XSD 1.1 built-in datatypes that are c
 | `xsd:unsignedInt` |      ✅      |        ❌        |    `int`    |     `dart:core`    |
 | `xsd:unsignedShort` |      ✅      |        ✅        |    `int`    |     `dart:core`    |
 | `xsd:unsignedByte` |      ✅      |        ✅        |    `int`    |     `dart:core`    |
-| `xsd:anyURI` |      ✅      |        ❌        |    `Uri`    |     `dart:core`    |
+| `xsd:anyURI` |      ✅      |        ✅        |    `Uri`    |     `dart:core`    |
 | `xsd:hexBinary` |      ✅      |        ✅        |    `Uint8List`    |     `dart:typed_data`    |
 | `xsd:base64Binary` |      ✅      |        ✅        |    `Uint8List`    |     `dart:typed_data`    |
 | `xsd:duration` |      ✅      |        ✅        |    `XsdDuration`[1]    |     `package:xsd`    |
@@ -71,6 +71,7 @@ This library aims to support the following XSD 1.1 built-in datatypes that are c
 | `xsd:NMTOKENS` |      ❌      |        ❌        |    ❌    |     ❌    |
 
 [1] **Note:** Although Dart already has a `Duration` class it actually represents an entirely different concept to the ISO8600 / XSD idea of a duration which `XsdDuration` implements.
+
 [2] **Note:** Dart's native `DateTime` class doesn't preserve the original timezone offset from a parsed string, which is important for round-tripping `xsd:dateTime` values. This wrapper class stores the original offset to address this.
 
 ## Limitations
diff --git a/lib/src/codecs/any_uri/any_uri_codec.dart b/lib/src/codecs/any_uri/any_uri_codec.dart
new file mode 100644
index 0000000..a2acd42
--- /dev/null
+++ b/lib/src/codecs/any_uri/any_uri_codec.dart
@@ -0,0 +1,31 @@
+import 'dart:convert';
+
+import 'package:xsd/src/helpers/whitespace.dart';
+
+/// A [Codec] that converts between XSD `anyURI` strings and [Uri] objects.
+class XsdAnyUriCodec extends Codec<Uri, String> {
+  const XsdAnyUriCodec();
+
+  @override
+  Converter<Uri, String> get encoder => const XsdAnyUriEncoder();
+
+  @override
+  Converter<String, Uri> get decoder => const XsdAnyUriDecoder();
+}
+
+class XsdAnyUriEncoder extends Converter<Uri, String> {
+  const XsdAnyUriEncoder();
+
+  @override
+  String convert(Uri input) => input.toString();
+}
+
+class XsdAnyUriDecoder extends Converter<String, Uri> {
+  const XsdAnyUriDecoder();
+
+  @override
+  Uri convert(String input) {
+    final trimmed = processWhiteSpace(input, Whitespace.collapse);
+    return Uri.parse(trimmed);
+  }
+}
diff --git a/lib/src/codecs/codecs.dart b/lib/src/codecs/codecs.dart
index 33d8a37..ac8d63f 100644
--- a/lib/src/codecs/codecs.dart
+++ b/lib/src/codecs/codecs.dart
@@ -24,3 +24,4 @@ export 'g_day/g_day_codec.dart';
 export 'g_month_day/gregorian_month_day_codec.dart';
 export 'duration/xsd_duration_codec.dart';
 export 'datetime/xsd_datetime_codec.dart';
+export 'any_uri/any_uri_codec.dart';
diff --git a/test/codecs/any_uri_test.dart b/test/codecs/any_uri_test.dart
new file mode 100644
index 0000000..d3b44d2
--- /dev/null
+++ b/test/codecs/any_uri_test.dart
@@ -0,0 +1,37 @@
+import 'package:test/test.dart';
+import 'package:xsd/xsd.dart';
+
+void main() {
+  group('XsdAnyUriCodec', () {
+    const codec = XsdAnyUriCodec();
+
+    test('should encode valid URI', () {
+      expect(
+        codec.encode(Uri.parse('http://example.com')),
+        'http://example.com',
+      );
+      expect(
+        codec.encode(Uri.parse('urn:isbn:1234567890')),
+        'urn:isbn:1234567890',
+      );
+    });
+
+    test('should decode valid URI', () {
+      expect(
+        codec.decode('http://example.com'),
+        Uri.parse('http://example.com'),
+      );
+      expect(
+        codec.decode('  http://example.com  '),
+        Uri.parse('http://example.com'),
+      );
+    });
+
+    test('should throw FormatException for invalid URI', () {
+      expect(
+        () => codec.decode('http://example.com::'),
+        throwsA(isA<FormatException>()),
+      );
+    });
+  });
+}