diff --git a/common/changes/office-ui-fabric-react/keco-nav-iconClassName_2018-04-20-18-21.json b/common/changes/office-ui-fabric-react/keco-nav-iconClassName_2018-04-20-18-21.json
new file mode 100644
index 00000000000000..42aa32093da8c8
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/keco-nav-iconClassName_2018-04-20-18-21.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "Deprecates INavLink.iconClassName in favor of IIconProps.className.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "keco@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/Nav/Nav.types.ts b/packages/office-ui-fabric-react/src/components/Nav/Nav.types.ts
index ff4b7897c4b517..cc269620a9eee9 100644
--- a/packages/office-ui-fabric-react/src/components/Nav/Nav.types.ts
+++ b/packages/office-ui-fabric-react/src/components/Nav/Nav.types.ts
@@ -155,7 +155,8 @@ export interface INavLink {
   icon?: string;
 
   /**
-   * Classname to apply to the icon link.
+   * Deprecated. Use iconProps.className instead.
+   * @deprecated
    */
   iconClassName?: string;
 
@@ -346,4 +347,4 @@ export interface INavStyles {
    * Style set for the group content div inside group.
    */
   groupContent: IStyle;
-}
\ No newline at end of file
+}