diff --git a/README.md b/README.md
index 37fbd5e3d..f783aa622 100644
--- a/README.md
+++ b/README.md
@@ -168,6 +168,7 @@ Validator                               | Description
 **isTime(str [, options])**             | check if the string is a valid time e.g. [`23:01:59`, new Date().toLocaleTimeString()].<br/><br/> `options` is an object which can contain the keys `hourFormat` or `mode`.<br/><br/>`hourFormat` is a key and defaults to `'hour24'`.<br/><br/>`mode` is a key and defaults to `'default'`. <br/><br/>`hourFormat` can contain the values `'hour12'` or `'hour24'`, `'hour24'` will validate hours in 24 format and `'hour12'` will validate hours in 12 format. <br/><br/>`mode` can contain the values `'default', 'withSeconds', withOptionalSeconds`, `'default'` will validate `HH:MM` format, `'withSeconds'` will validate the `HH:MM:SS` format, `'withOptionalSeconds'` will validate `'HH:MM'` and `'HH:MM:SS'` formats.
 **isTaxID(str, locale)**                | check if the string is a valid Tax Identification Number. Default locale is `en-US`.<br/><br/>More info about exact TIN support can be found in `src/lib/isTaxID.js`.<br/><br/>Supported locales: `[ 'bg-BG', 'cs-CZ', 'de-AT', 'de-DE', 'dk-DK', 'el-CY', 'el-GR', 'en-CA', 'en-GB', 'en-IE', 'en-US', 'es-AR', 'es-ES', 'et-EE', 'fi-FI', 'fr-BE', 'fr-CA', 'fr-FR', 'fr-LU', 'hr-HR', 'hu-HU', 'it-IT', 'lb-LU', 'lt-LT', 'lv-LV', 'mt-MT', 'nl-BE', 'nl-NL', 'pl-PL', 'pt-BR', 'pt-PT', 'ro-RO', 'sk-SK', 'sl-SI', 'sv-SE', 'uk-UA']`.
 **isURL(str [, options])**              | check if the string is a URL.<br/><br/>`options` is an object which defaults to `{ protocols: ['http','https','ftp'], require_tld: true, require_protocol: false, require_host: true, require_port: false, require_valid_protocol: true, allow_underscores: false, host_whitelist: false, host_blacklist: false, allow_trailing_dot: false, allow_protocol_relative_urls: false, allow_fragments: true, allow_query_components: true, disallow_auth: false, validate_length: true }`.<br/><br/>`protocols` - valid protocols can be modified with this option.<br/>`require_tld` - If set to false isURL will not check if the URL's host includes a top-level domain.<br/>`require_protocol` - **RECOMMENDED** if set to true isURL will return false if protocol is not present in the URL. Without this setting, some malicious URLs cannot be distinguishable from a valid URL with authentication information.<br/>`require_host` - if set to false isURL will not check if host is present in the URL.<br/>`require_port` - if set to true isURL will check if port is present in the URL.<br/>`require_valid_protocol` - isURL will check if the URL's protocol is present in the protocols option.<br/>`allow_underscores` - if set to true, the validator will allow underscores in the URL.<br/>`host_whitelist` - if set to an array of strings or regexp, and the domain matches none of the strings defined in it, the validation fails.<br/>`host_blacklist` - if set to an array of strings or regexp, and the domain matches any of the strings defined in it, the validation fails.<br/>`allow_trailing_dot` - if set to true, the validator will allow the domain to end with a `.` character.<br/>`allow_protocol_relative_urls` - if set to true protocol relative URLs will be allowed.<br/>`allow_fragments` - if set to false isURL will return false if fragments are present.<br/>`allow_query_components` - if set to false isURL will return false if query components are present.<br/>`disallow_auth` - if set to true, the validator will fail if the URL contains an authentication component, e.g. `http://username:password@example.com`.<br/>`validate_length` - if set to false isURL will skip string length validation. `max_allowed_length` will be ignored if this is set as `false`.<br/>`max_allowed_length` - if set, isURL will not allow URLs longer than the specified value (default is 2084 that IE maximum URL length).<br/>
+**isXsdAnyURI(str)**                   | check if the string conforms to the [XML Schema `anyURI` type](https://www.w3.org/TR/xmlschema-2/#anyURI). Leading/trailing XML whitespace is collapsed before validation and any non-ASCII characters are percent-encoded via `encodeURI` semantics before the RFC 3986 rules are applied. Both absolute and relative references (including query-only or fragment-only references) are supported.
 **isULID(str)**                         | check if the string is a [ULID](https://github.com/ulid/spec).
 **isUUID(str [, version])**             | check if the string is an RFC9562 UUID.<br/>`version` is one of `'1'`-`'8'`, `'nil'`, `'max'`, `'all'` or `'loose'`. The `'loose'` option checks if the string is a UUID-like string with hexadecimal values, ignoring RFC9565.
 **isVariableWidth(str)**                | check if the string contains a mixture of full and half-width chars.
diff --git a/src/index.js b/src/index.js
index ccbcc4188..0fb21d77f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -8,6 +8,7 @@ import matches from './lib/matches';
 
 import isEmail from './lib/isEmail';
 import isURL from './lib/isURL';
+import isXsdAnyURI from './lib/isXsdAnyURI';
 import isMACAddress from './lib/isMACAddress';
 import isIP from './lib/isIP';
 import isIPRange from './lib/isIPRange';
@@ -143,6 +144,7 @@ const validator = {
   matches,
   isEmail,
   isURL,
+  isXsdAnyURI,
   isMACAddress,
   isIP,
   isIPRange,
diff --git a/src/lib/isXsdAnyURI.js b/src/lib/isXsdAnyURI.js
new file mode 100644
index 000000000..a03e34101
--- /dev/null
+++ b/src/lib/isXsdAnyURI.js
@@ -0,0 +1,300 @@
+import assertString from './util/assertString';
+import isIP from './isIP';
+
+const MULTIPLE_SPACES_REGEX = / {2,}/g;
+const INVALID_PERCENT_REGEX = /%(?![0-9A-Fa-f]{2})/;
+const SCHEME_REGEX = /^[A-Za-z][A-Za-z0-9+.-]*$/;
+const BACKSLASH_REGEX = /\\/;
+const DISALLOWED_ASCII_REGEX = /["<>^`{}|]/;
+const OPEN_BRACKET_PLACEHOLDER = '__VALIDATOR_OPEN_BRACKET__';
+const CLOSE_BRACKET_PLACEHOLDER = '__VALIDATOR_CLOSE_BRACKET__';
+
+const HEX_DIGIT = '[0-9A-Fa-f]';
+const PCT_ENCODED = `%${HEX_DIGIT}{2}`;
+const UNRESERVED = 'A-Za-z0-9\\-._~';
+const SUB_DELIMS = "!$&'()*+,;=";
+const PCHAR = `(?:[${UNRESERVED}]|${PCT_ENCODED}|[${SUB_DELIMS}:@])`;
+const SEGMENT = `(?:${PCHAR})*`;
+const SEGMENT_NZ = `(?:${PCHAR})+`;
+const SEGMENT_NZ_NC = `(?:${PCT_ENCODED}|[${UNRESERVED}${SUB_DELIMS}@])+`;
+
+const PATH_ABEMPTY_REGEX = new RegExp(`^(?:/${SEGMENT})*$`);
+const PATH_ABSOLUTE_REGEX = new RegExp(`^/(?:${SEGMENT_NZ}(?:/${SEGMENT})*)?$`);
+const PATH_ROOTLESS_REGEX = new RegExp(`^${SEGMENT_NZ}(?:/${SEGMENT})*$`);
+const PATH_NOSCHEME_REGEX = new RegExp(`^(?:${SEGMENT_NZ_NC})(?:/${SEGMENT})*$`);
+const QUERY_FRAGMENT_REGEX = new RegExp(`^(?:${PCHAR}|[/?])*$`);
+const USERINFO_REGEX = new RegExp(`^(?:${PCT_ENCODED}|[${UNRESERVED}${SUB_DELIMS}:])*$`);
+const REG_NAME_REGEX = new RegExp(`^(?:${PCT_ENCODED}|[${UNRESERVED}${SUB_DELIMS}])*$`);
+const IPV_FUTURE_REGEX = /^v[0-9A-F]+\.[A-Za-z0-9._~!$&'()*+,;=:-]+$/i;
+
+function collapseXmlWhitespace(input) {
+  let normalized = '';
+
+  for (let i = 0; i < input.length; i += 1) {
+    const code = input.charCodeAt(i);
+
+    if (code === 0x09 || code === 0x0a || code === 0x0d) {
+      normalized += ' ';
+    } else {
+      normalized += input[i];
+    }
+  }
+
+  return normalized.replace(MULTIPLE_SPACES_REGEX, ' ').trim();
+}
+
+function containsForbiddenControl(value) {
+  for (let i = 0; i < value.length; i += 1) {
+    const code = value.charCodeAt(i);
+
+    if (
+      (code >= 0x00 && code <= 0x08) ||
+      code === 0x0b ||
+      code === 0x0c ||
+      (code >= 0x0e && code <= 0x1f) ||
+      code === 0x7f
+    ) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+function hasInvalidPercentEncoding(input) {
+  return INVALID_PERCENT_REGEX.test(input);
+}
+
+function isIPvFuture(address) {
+  return IPV_FUTURE_REGEX.test(address);
+}
+
+function isValidAuthority(authority, options) {
+  const allowEmptyAuthority = Boolean(options && options.allowEmptyAuthority);
+  if (authority === '') {
+    return !!allowEmptyAuthority;
+  }
+
+  let hostPort = authority;
+  let userinfo = '';
+  const atIndex = authority.lastIndexOf('@');
+
+  if (atIndex !== -1) {
+    userinfo = authority.slice(0, atIndex);
+    hostPort = authority.slice(atIndex + 1);
+
+    if (!USERINFO_REGEX.test(userinfo)) {
+      return false;
+    }
+  }
+
+  let host = hostPort;
+  let port = null;
+  let hasHost = false;
+
+  if (hostPort.startsWith('[')) {
+    const closingIndex = hostPort.indexOf(']');
+
+    if (closingIndex === -1) {
+      return false;
+    }
+
+    const address = hostPort.slice(1, closingIndex);
+
+    if (!isIP(address, 6) && !isIPvFuture(address)) {
+      return false;
+    }
+
+    const remainder = hostPort.slice(closingIndex + 1);
+
+    if (remainder) {
+      if (!remainder.startsWith(':')) {
+        return false;
+      }
+
+      port = remainder.slice(1);
+    }
+
+    hasHost = true;
+  } else {
+    const firstColon = hostPort.indexOf(':');
+    const lastColon = hostPort.lastIndexOf(':');
+
+    if (firstColon !== lastColon) {
+      return false;
+    }
+
+    if (lastColon !== -1) {
+      host = hostPort.slice(0, lastColon);
+      port = hostPort.slice(lastColon + 1);
+    }
+
+    if (host) {
+      hasHost = true;
+
+      if (!isIP(host, 4) && !REG_NAME_REGEX.test(host)) {
+        return false;
+      }
+    }
+  }
+
+  if (!hasHost) {
+    return false;
+  }
+
+  if (port !== null) {
+    if (port === '' || !/^[0-9]+$/.test(port)) {
+      return false;
+    }
+
+    const portNumber = parseInt(port, 10);
+
+    if (Number.isNaN(portNumber) || portNumber > 65535) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+function isValidPath(path, { hasAuthority, hasScheme }) {
+  if (hasAuthority) {
+    return PATH_ABEMPTY_REGEX.test(path);
+  }
+
+  if (hasScheme) {
+    if (path === '') {
+      return true;
+    }
+
+    if (path.startsWith('/')) {
+      return PATH_ABSOLUTE_REGEX.test(path);
+    }
+
+    return PATH_ROOTLESS_REGEX.test(path);
+  }
+
+  if (path === '') {
+    return true;
+  }
+
+  if (path.startsWith('/')) {
+    return PATH_ABSOLUTE_REGEX.test(path);
+  }
+
+  return PATH_NOSCHEME_REGEX.test(path);
+}
+
+function isValidQueryOrFragment(value) {
+  return value === '' || QUERY_FRAGMENT_REGEX.test(value);
+}
+
+function isValidUriReference(value) {
+  let rest = value;
+  let scheme = null;
+  let hadScheme = false;
+
+  const colonIndex = rest.indexOf(':');
+
+  if (colonIndex > 0) {
+    const potentialScheme = rest.slice(0, colonIndex);
+
+    if (SCHEME_REGEX.test(potentialScheme)) {
+      scheme = potentialScheme;
+      hadScheme = true;
+      rest = rest.slice(colonIndex + 1);
+    }
+  }
+
+  let fragment = '';
+  const hashIndex = rest.indexOf('#');
+
+  if (hashIndex !== -1) {
+    fragment = rest.slice(hashIndex + 1);
+    rest = rest.slice(0, hashIndex);
+
+    if (!isValidQueryOrFragment(fragment)) {
+      return false;
+    }
+  }
+
+  let query = '';
+  const questionIndex = rest.indexOf('?');
+
+  if (questionIndex !== -1) {
+    query = rest.slice(questionIndex + 1);
+    rest = rest.slice(0, questionIndex);
+
+    if (!isValidQueryOrFragment(query)) {
+      return false;
+    }
+  }
+
+  let hasAuthority = false;
+  let authority = '';
+  let path = rest;
+
+  if (rest.startsWith('//')) {
+    hasAuthority = true;
+    rest = rest.slice(2);
+    const nextSlash = rest.indexOf('/');
+
+    if (nextSlash === -1) {
+      authority = rest;
+      path = '';
+    } else {
+      authority = rest.slice(0, nextSlash);
+      path = rest.slice(nextSlash);
+    }
+
+    const allowEmptyAuthority = Boolean(hadScheme && scheme && scheme.toLowerCase() === 'file');
+    const authorityOptions = allowEmptyAuthority
+      ? { allowEmptyAuthority: true }
+      : undefined;
+
+    if (!isValidAuthority(authority, authorityOptions)) {
+      return false;
+    }
+  }
+
+  return isValidPath(path, { hasAuthority, hasScheme: hadScheme });
+}
+
+export default function isXsdAnyURI(input) {
+  assertString(input);
+
+  let value = collapseXmlWhitespace(input);
+
+  if (value === '') {
+    return true;
+  }
+
+  if (
+    containsForbiddenControl(value) ||
+    hasInvalidPercentEncoding(value) ||
+    BACKSLASH_REGEX.test(value) ||
+    DISALLOWED_ASCII_REGEX.test(value)
+  ) {
+    return false;
+  }
+
+  let encoded;
+
+  try {
+    const bracketSafeValue = value
+      .replace(/\[/g, OPEN_BRACKET_PLACEHOLDER)
+      .replace(/\]/g, CLOSE_BRACKET_PLACEHOLDER);
+
+    const encodedWithPlaceholders = encodeURI(bracketSafeValue);
+
+    encoded = encodedWithPlaceholders
+      .split(OPEN_BRACKET_PLACEHOLDER)
+      .join('[')
+      .split(CLOSE_BRACKET_PLACEHOLDER)
+      .join(']');
+  } catch (err) {
+    return false;
+  }
+
+  return isValidUriReference(encoded);
+}
diff --git a/test/validators.test.js b/test/validators.test.js
index 7eef901b8..9a6e76a5f 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -1017,6 +1017,69 @@ describe('Validators', () => {
     });
   });
 
+  it('should validate XML Schema AnyURI values', () => {
+    test({
+      validator: 'isXsdAnyURI',
+      valid: [
+        'http://example.com',
+        'https://example.com:8080/path?query=1#frag',
+        'mailto:user@example.com',
+        'urn:isbn:0451450523',
+        'data:text/plain;charset=utf-8,Hello%20World',
+        '../relative/path',
+        '/absolute/path',
+        '//cdn.example.com/libs.js',
+        '#fragment-only',
+        '?queryOnly=true',
+        'file:///C:/Program%20Files/MyApp/app.exe',
+        'http://[2001:db8::1]:443/path',
+        'http://[v7.fe80::abcd]/resource',
+        'https://user:pa%20ss@example.com:8443/resource',
+        '  https://example.com/with-space  ',
+        ' \t\nhttps://example.com/resource\r\n',
+        'foo%20bar/baz',
+        'tel:+123456789',
+        'foo:',
+        'foo:/bar',
+        'file:///var/log',
+        'http://[2001:db8::1]:1234',
+        '',
+        'file:///',
+        '//example.com/path#frag',
+      ],
+      invalid: [
+        'http://example.com:99999',
+        'http://example.com:port',
+        'http://example.com:-1',
+        'http://[::1',
+        'http://example.com#frag#extra',
+        'foo%zz',
+        'foo%2',
+        'http://user@:8080',
+        'http://user[info@example.com',
+        '\\server\\share',
+        'http://example.com/pa|th',
+        'http://example.com/path\u0006',
+        '//:8080/path',
+        'http:///path',
+        'file://user@',
+        'http://example.com/%',
+        'foo#frag%2',
+        'http://example.com/%ZZ',
+        'http://example.com/?q=abc^123',
+        'http://example.com?foo[bar',
+        'foo://?query',
+        'foo%2/bar',
+        'http://[::g]/path',
+        'http://[::1]foo',
+        'http://host:80:123/path',
+        'http://exa[mple.com',
+        'http://example.com/\ud800',
+        'foo<bar',
+      ],
+    });
+  });
+
   it('should validate MAC addresses', () => {
     test({
       validator: 'isMACAddress',