diff --git a/test/objects.js b/test/objects.js
index 8fb3d1b9d..2ee0a514d 100644
--- a/test/objects.js
+++ b/test/objects.js
@@ -491,6 +491,20 @@ $(document).ready(function() {
     ok(_.isRegExp(iRegExp), 'even from another frame');
   });
 
+  test("objects: isFinite", function() {
+    ok(!_.isFinite(undefined), 'undefined is not Finite');
+    ok(!_.isFinite(null), 'null is not Finite');
+    ok(!_.isFinite(NaN), 'NaN is not Finite');
+    ok(!_.isFinite(Infinity), 'Infinity is not Finite');
+    ok(!_.isFinite(-Infinity), '-Infinity is not Finite');
+    ok(!_.isFinite('12'), 'Strings are not numbers');
+    var obj = new Number(5);
+    ok(_.isFinite(obj), 'Number instances can be finite');
+    ok(_.isFinite(0), '0 is Finite');
+    ok(_.isFinite(123), 'Ints are Finite');
+    ok(_.isFinite(-12.44), 'Floats are Finite');
+  });
+
   test("objects: isNaN", function() {
     ok(!_.isNaN(undefined), 'undefined is not NaN');
     ok(!_.isNaN(null), 'null is not NaN');
diff --git a/underscore.js b/underscore.js
index cb2d424de..4276ece3e 100644
--- a/underscore.js
+++ b/underscore.js
@@ -824,6 +824,11 @@
     return toString.call(obj) == '[object Number]';
   };
 
+  // Is a givin number finite?
+  _.isFinite = function(obj) {
+    return _.isNumber(obj) && isFinite(obj);
+  };
+
   // Is the given value `NaN`?
   _.isNaN = function(obj) {
     // `NaN` is the only value for which `===` is not reflexive.