diff --git a/types/validator/index.d.ts b/types/validator/index.d.ts
index 9815596990..d6b196f0d9 100644
--- a/types/validator/index.d.ts
+++ b/types/validator/index.d.ts
@@ -129,6 +129,10 @@ declare namespace ValidatorJS {
     // country code.
     isISO31661Alpha2(str: string): boolean;
 
+    // check if the string is a valid ISO 3166-1 alpha-3 (https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3) officially assigned
+    // country code.
+    isISO31661Alpha3(str: string): boolean;
+
     // check if the string is a ISRC (https://en.wikipedia.org/wiki/International_Standard_Recording_Code).
     isISRC(str: string): boolean;
 
diff --git a/types/validator/lib/isISO31661Alpha3.d.ts b/types/validator/lib/isISO31661Alpha3.d.ts
new file mode 100644
index 0000000000..b209642820
--- /dev/null
+++ b/types/validator/lib/isISO31661Alpha3.d.ts
@@ -0,0 +1,3 @@
+import * as validator from "validator";
+declare const isISO31661Alpha3: typeof validator.isISO31661Alpha3;
+export = isISO31661Alpha3;
\ No newline at end of file
diff --git a/types/validator/tsconfig.json b/types/validator/tsconfig.json
index af6172b88a..c50e120dc2 100644
--- a/types/validator/tsconfig.json
+++ b/types/validator/tsconfig.json
@@ -47,6 +47,7 @@
         "lib/isISIN.d.ts",
         "lib/isISO8601.d.ts",
         "lib/isISO31661Alpha2.d.ts",
+        "lib/isISO31661Alpha3.d.ts",
         "lib/isISRC.d.ts",
         "lib/isIn.d.ts",
         "lib/isInt.d.ts",
diff --git a/types/validator/validator-tests.ts b/types/validator/validator-tests.ts
index a9f27fce4a..bc0630e297 100644
--- a/types/validator/validator-tests.ts
+++ b/types/validator/validator-tests.ts
@@ -37,6 +37,7 @@ import isISSNFunc = require('validator/lib/isISSN');
 import isISINFunc = require('validator/lib/isISIN');
 import isISO8601Func = require('validator/lib/isISO8601');
 import isISO31661Alpha2Func = require('validator/lib/isISO31661Alpha2');
+import isISO31661Alpha3Func = require('validator/lib/isISO31661Alpha3');
 import isISRCFunc = require('validator/lib/isISRC');
 import isInFunc = require('validator/lib/isIn');
 import isIntFunc = require('validator/lib/isInt');
@@ -170,6 +171,9 @@ import whitelistFunc = require('validator/lib/whitelist');
   let _isISO31661Alpha2 = validator.isISO31661Alpha2;
   _isISO31661Alpha2 = isISO31661Alpha2Func;
 
+  let _isISO31661Alpha3 = validator.isISO31661Alpha3;
+  _isISO31661Alpha3 = isISO31661Alpha3Func;
+
   let _isISRC = validator.isISRC;
   _isISRC = isISRCFunc;
 
@@ -480,6 +484,7 @@ let any: any;
   result = validator.isISO8601('sample', isISO8601Options);
 
   result = validator.isISO31661Alpha2('sample');
+  result = validator.isISO31661Alpha3('sample');
 
   result = validator.isISRC('sample');