diff --git a/lib/less/functions.js b/lib/less/functions.js
index 6eb34bac8..98a4517f5 100644
--- a/lib/less/functions.js
+++ b/lib/less/functions.js
@@ -124,6 +124,22 @@ tree.functions = {
     greyscale: function (color) {
         return this.desaturate(color, new(tree.Dimension)(100));
     },
+    contrast: function (color, light, dark) {
+        var hsl = color.toHSL();
+        if (arguments.length == 1) {
+            if (hsl.l > 0.5) {
+                return this.rgba(0, 0, 0, 1.0);
+            } else {
+                return this.rgba(255, 255, 255, 1.0);
+            }
+        } else if (arguments.length == 3) {
+            if (hsl.l > 0.5) {
+                return dark;
+            } else {
+                return light;
+            }
+        }
+    },
     e: function (str) {
         return new(tree.Anonymous)(str instanceof tree.JavaScript ? str.evaluated : str);
     },
diff --git a/test/css/functions.css b/test/css/functions.css
index 823281457..1d3873746 100644
--- a/test/css/functions.css
+++ b/test/css/functions.css
@@ -14,6 +14,10 @@
   greyscale: #2e2e2e;
   spin-p: #bf6a40;
   spin-n: #bf4055;
+  contrast-white: #000000;
+  contrast-black: #ffffff;
+  contrast-light: #111111;
+  contrast-dark: #eeeeee;
   format: "rgb(32, 128, 64)";
   format-string: "hello world";
   format-multiple: "hello earth 2";
diff --git a/test/less/functions.less b/test/less/functions.less
index 535d2efde..097adcf70 100644
--- a/test/less/functions.less
+++ b/test/less/functions.less
@@ -17,6 +17,10 @@
   greyscale: greyscale(#203c31);
   spin-p: spin(hsl(340, 50%, 50%), 40);
   spin-n: spin(hsl(30, 50%, 50%), -40);
+  contrast-white: contrast(#fff);
+  contrast-black: contrast(#000);
+  contrast-light: contrast(#fff, #eeeeee, #111111);
+  contrast-dark: contrast(#000, #eeeeee, #111111);
   format: %("rgb(%d, %d, %d)", @r, 128, 64);
   format-string: %("hello %s", "world");
   format-multiple: %("hello %s %d", "earth", 2);