diff --git a/base.php b/base.php
index 7f8f1e9..80bb5fc 100644
--- a/base.php
+++ b/base.php
@@ -1,3 +1,10 @@
+<?php
+
+namespace Roots\Sage;
+use Roots\Sage\Config;
+use Roots\Sage\Wrapper;
+?>
+
 <?php get_template_part('templates/head'); ?>
 <body <?php body_class(); ?>>
 
@@ -15,11 +22,11 @@
   <div class="wrap container" role="document">
     <div class="content row">
       <main class="main" role="main">
-        <?php include sage_template_path(); ?>
+        <?php include Wrapper\template_path(); ?>
       </main><!-- /.main -->
-      <?php if (sage_display_sidebar()) : ?>
+      <?php if (Config\display_sidebar()) : ?>
         <aside class="sidebar" role="complementary">
-          <?php include sage_sidebar_path(); ?>
+          <?php include Wrapper\sidebar_path(); ?>
         </aside><!-- /.sidebar -->
       <?php endif; ?>
     </div><!-- /.content -->
diff --git a/lib/assets.php b/lib/assets.php
index 307bc4e..12644ce 100644
--- a/lib/assets.php
+++ b/lib/assets.php
@@ -1,4 +1,7 @@
 <?php
+
+namespace Roots\Sage\Assets;
+
 /**
  * Scripts and stylesheets
  *
@@ -14,7 +17,7 @@
  * - An ID has been defined in config.php
  * - You're not logged in as an administrator
  */
-function sage_asset_path($filename) {
+function asset_path($filename) {
   if (WP_ENV === 'development') {
     return get_template_directory_uri() . '/dist/' . $filename;
   }
@@ -32,8 +35,8 @@ function sage_asset_path($filename) {
   }
 }
 
-function sage_assets() {
-  wp_enqueue_style('sage_css', sage_asset_path('styles/main.css'), false, null);
+function assets() {
+  wp_enqueue_style('sage_css', asset_path('styles/main.css'), false, null);
 
   /**
    * Grab Google CDN's latest jQuery with a protocol relative URL; fallback to local if offline
@@ -46,21 +49,21 @@ function sage_assets() {
 
     wp_register_script('jquery', '//ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.js', array(), null, true);
 
-    add_filter('script_loader_src', 'sage_jquery_local_fallback', 10, 2);
+    add_filter('script_loader_src', __NAMESPACE__ . '\\jquery_local_fallback', 10, 2);
   }
 
   if (is_single() && comments_open() && get_option('thread_comments')) {
     wp_enqueue_script('comment-reply');
   }
 
-  wp_enqueue_script('modernizr', sage_asset_path('scripts/modernizr.js'), array(), null, true);
+  wp_enqueue_script('modernizr', asset_path('scripts/modernizr.js'), array(), null, true);
   wp_enqueue_script('jquery');
-  wp_enqueue_script('sage_js', sage_asset_path('scripts/app.js'), array(), null, true);
+  wp_enqueue_script('sage_js', asset_path('scripts/app.js'), array(), null, true);
 }
-add_action('wp_enqueue_scripts', 'sage_assets', 100);
+add_action('wp_enqueue_scripts', __NAMESPACE__ . '\\assets', 100);
 
 // http://wordpress.stackexchange.com/a/12450
-function sage_jquery_local_fallback($src, $handle = null) {
+function jquery_local_fallback($src, $handle = null) {
   static $add_jquery_fallback = false;
 
   if ($add_jquery_fallback) {
@@ -74,14 +77,14 @@ function sage_jquery_local_fallback($src, $handle = null) {
 
   return $src;
 }
-add_action('wp_head', 'sage_jquery_local_fallback');
+add_action('wp_head', __NAMESPACE__ . '\\jquery_local_fallback');
 
 /**
  * Google Analytics snippet from HTML5 Boilerplate
  *
  * Cookie domain is 'auto' configured. See: http://goo.gl/VUCHKM
  */
-function sage_google_analytics() { ?>
+function google_analytics() { ?>
 <script>
   <?php if (WP_ENV === 'production') : ?>
     (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
@@ -99,5 +102,5 @@ function sage_google_analytics() { ?>
 
 <?php }
 if (GOOGLE_ANALYTICS_ID && (WP_ENV !== 'production' || !current_user_can('manage_options'))) {
-  add_action('wp_footer', 'sage_google_analytics', 20);
+  add_action('wp_footer', __NAMESPACE__ . '\\google_analytics', 20);
 }
diff --git a/lib/config.php b/lib/config.php
index cade30e..ed22120 100644
--- a/lib/config.php
+++ b/lib/config.php
@@ -1,4 +1,8 @@
 <?php
+
+namespace Roots\Sage\Config;
+use Roots\Sage\Sidebar;
+
 /**
  * Enable theme features
  */
@@ -20,24 +24,24 @@ if (!defined('WP_ENV')) {
 /**
  * Add body class if sidebar is active
  */
-function sage_sidebar_body_class($classes) {
-  if (sage_display_sidebar()) {
+function sidebar_body_class($classes) {
+  if (display_sidebar()) {
     $classes[] = 'sidebar-primary';
   }
   return $classes;
 }
-add_filter('body_class', 'sage_sidebar_body_class');
+add_filter('body_class', __NAMESPACE__ . '\\sidebar_body_class');
 
 /**
  * Define which pages shouldn't have the sidebar
  *
  * See lib/sidebar.php for more details
  */
-function sage_display_sidebar() {
+function display_sidebar() {
   static $display;
 
   if (!isset($display)) {
-    $sidebar_config = new Sage_Sidebar(
+    $sidebar_config = new Sidebar\Sage_Sidebar(
       /**
        * Conditional tag checks (http://codex.wordpress.org/Conditional_Tags)
        * Any of these conditional tags that return true won't show the sidebar
diff --git a/lib/extras.php b/lib/extras.php
index 3c11b75..40140cc 100644
--- a/lib/extras.php
+++ b/lib/extras.php
@@ -1,8 +1,11 @@
 <?php
+
+namespace Roots\Sage\Extras;
+
 /**
  * Clean up the_excerpt()
  */
-function sage_excerpt_more() {
+function excerpt_more() {
   return ' &hellip; <a href="' . get_permalink() . '">' . __('Continued', 'sage') . '</a>';
 }
-add_filter('excerpt_more', 'sage_excerpt_more');
+add_filter('excerpt_more', __NAMESPACE__ . '\\excerpt_more');
diff --git a/lib/gallery.php b/lib/gallery.php
index ed9606a..874a8e1 100644
--- a/lib/gallery.php
+++ b/lib/gallery.php
@@ -1,4 +1,7 @@
 <?php
+
+namespace Roots\Sage\Gallery;
+
 /**
  * Clean up gallery_shortcode()
  *
@@ -7,7 +10,7 @@
  *
  * @link http://getbootstrap.com/components/#thumbnails
  */
-function sage_gallery($attr) {
+function gallery($attr) {
   $post = get_post();
 
   static $instance = 0;
@@ -115,15 +118,15 @@ function sage_gallery($attr) {
 }
 if (current_theme_supports('bootstrap-gallery')) {
   remove_shortcode('gallery');
-  add_shortcode('gallery', 'sage_gallery');
+  add_shortcode('gallery', __NAMESPACE__ . '\\gallery');
   add_filter('use_default_gallery_style', '__return_null');
 }
 
 /**
  * Add class="thumbnail img-thumbnail" to attachment items
  */
-function sage_attachment_link_class($html) {
+function attachment_link_class($html) {
   $html = str_replace('<a', '<a class="thumbnail img-thumbnail"', $html);
   return $html;
 }
-add_filter('wp_get_attachment_link', 'sage_attachment_link_class', 10, 1);
+add_filter('wp_get_attachment_link', __NAMESPACE__ . '\\attachment_link_class', 10, 1);
diff --git a/lib/init.php b/lib/init.php
index f56bf64..e8fcf02 100644
--- a/lib/init.php
+++ b/lib/init.php
@@ -1,8 +1,11 @@
 <?php
+
+namespace Roots\Sage\Init;
+
 /**
  * Sage initial setup and constants
  */
-function sage_setup() {
+function setup() {
   // Make theme available for translation
   // Community translations can be found at https://github.com/roots/sage-translations
   load_theme_textdomain('sage', get_template_directory() . '/lang');
@@ -34,12 +37,12 @@ function sage_setup() {
   // Tell the TinyMCE editor to use a custom stylesheet
   add_editor_style('/dist/css/editor-style.css');
 }
-add_action('after_setup_theme', 'sage_setup');
+add_action('after_setup_theme', __NAMESPACE__ . '\\setup');
 
 /**
  * Register sidebars
  */
-function sage_widgets_init() {
+function widgets_init() {
   register_sidebar(array(
     'name'          => __('Primary', 'sage'),
     'id'            => 'sidebar-primary',
@@ -58,4 +61,4 @@ function sage_widgets_init() {
     'after_title'   => '</h3>',
   ));
 }
-add_action('widgets_init', 'sage_widgets_init');
+add_action('widgets_init', __NAMESPACE__ . '\\widgets_init');
diff --git a/lib/nav.php b/lib/nav.php
index 9713004..6728f1e 100644
--- a/lib/nav.php
+++ b/lib/nav.php
@@ -1,4 +1,7 @@
 <?php
+
+namespace Roots\Sage\Nav;
+
 /**
  * Cleaner walker for wp_nav_menu()
  *
@@ -10,7 +13,7 @@
  *   <li class="menu-home"><a href="/">Home</a></li>
  *   <li class="menu-sample-page"><a href="/sample-page/">Sample Page</a></li>
  */
-class Sage_Nav_Walker extends Walker_Nav_Menu {
+class Sage_Nav_Walker extends \Walker_Nav_Menu {
   function check_current($classes) {
     return preg_match('/(current[-_])|active|dropdown/', $classes);
   }
@@ -53,7 +56,7 @@ class Sage_Nav_Walker extends Walker_Nav_Menu {
  * Remove the id="" on nav menu items
  * Return 'menu-slug' for nav menu classes
  */
-function sage_nav_menu_css_class($classes, $item) {
+function nav_menu_css_class($classes, $item) {
   $slug = sanitize_title($item->title);
   $classes = preg_replace('/(current(-menu-|[-_]page[-_])(item|parent|ancestor))/', 'active', $classes);
   $classes = preg_replace('/^((menu|page)[-_\w+]+)+/', '', $classes);
@@ -62,9 +65,9 @@ function sage_nav_menu_css_class($classes, $item) {
 
   $classes = array_unique($classes);
 
-  return array_filter($classes, 'is_element_empty');
+  return array_filter($classes, 'Roots\\Sage\\Utils\\is_element_empty');
 }
-add_filter('nav_menu_css_class', 'sage_nav_menu_css_class', 10, 2);
+add_filter('nav_menu_css_class', __NAMESPACE__ . '\\nav_menu_css_class', 10, 2);
 add_filter('nav_menu_item_id', '__return_null');
 
 /**
@@ -73,19 +76,19 @@ add_filter('nav_menu_item_id', '__return_null');
  * Remove the container
  * Use Sage_Nav_Walker() by default
  */
-function sage_nav_menu_args($args = '') {
-  $sage_nav_menu_args = array();
+function nav_menu_args($args = '') {
+  $nav_menu_args = array();
 
-  $sage_nav_menu_args['container'] = false;
+  $nav_menu_args['container'] = false;
 
   if (!$args['items_wrap']) {
-    $sage_nav_menu_args['items_wrap'] = '<ul class="%2$s">%3$s</ul>';
+    $nav_menu_args['items_wrap'] = '<ul class="%2$s">%3$s</ul>';
   }
 
   if (!$args['depth']) {
-    $sage_nav_menu_args['depth'] = 2;
+    $nav_menu_args['depth'] = 2;
   }
 
-  return array_merge($args, $sage_nav_menu_args);
+  return array_merge($args, $nav_menu_args);
 }
-add_filter('wp_nav_menu_args', 'sage_nav_menu_args');
+add_filter('wp_nav_menu_args', __NAMESPACE__ . '\\nav_menu_args');
diff --git a/lib/sidebar.php b/lib/sidebar.php
index d309a7a..f51635c 100644
--- a/lib/sidebar.php
+++ b/lib/sidebar.php
@@ -1,4 +1,7 @@
 <?php
+
+namespace Roots\Sage\Sidebar;
+
 /**
  * Determines whether or not to display the sidebar based on an array of conditional tags or page templates.
  *
diff --git a/lib/titles.php b/lib/titles.php
index d16d646..cdabacd 100644
--- a/lib/titles.php
+++ b/lib/titles.php
@@ -1,8 +1,11 @@
 <?php
+
+namespace Roots\Sage\Titles;
+
 /**
  * Page titles
  */
-function sage_title() {
+function title() {
   if (is_home()) {
     if (get_option('page_for_posts', true)) {
       return get_the_title(get_option('page_for_posts', true));
diff --git a/lib/utils.php b/lib/utils.php
index 5406914..fc1be36 100644
--- a/lib/utils.php
+++ b/lib/utils.php
@@ -1,4 +1,7 @@
 <?php
+
+namespace Roots\Sage\Utils;
+
 /**
  * Utility functions
  */
@@ -8,17 +11,17 @@ function is_element_empty($element) {
 }
 
 // Tell WordPress to use searchform.php from the templates/ directory
-function sage_get_search_form() {
+function get_search_form() {
   $form = '';
   locate_template('/templates/searchform.php', true, false);
   return $form;
 }
-add_filter('get_search_form', 'sage_get_search_form');
+add_filter('get_search_form', __NAMESPACE__ . '\\get_search_form');
 
 /**
  * Add page slug to body_class() classes if it doesn't exist
  */
-function sage_body_class($classes) {
+function body_class($classes) {
   // Add post/page slug
   if (is_single() || is_page() && !is_front_page()) {
     if (!in_array(basename(get_permalink()), $classes)) {
@@ -27,4 +30,4 @@ function sage_body_class($classes) {
   }
   return $classes;
 }
-add_filter('body_class', 'sage_body_class');
+add_filter('body_class', __NAMESPACE__ . '\\body_class');
diff --git a/lib/wrapper.php b/lib/wrapper.php
index 6bbb565..cf2eb0e 100644
--- a/lib/wrapper.php
+++ b/lib/wrapper.php
@@ -1,15 +1,19 @@
 <?php
+
+namespace Roots\Sage\Wrapper;
+
 /**
  * Theme wrapper
  *
  * @link http://roots.io/getting-started/theme-wrapper/
  * @link http://scribu.net/wordpress/theme-wrappers.html
  */
-function sage_template_path() {
+
+function template_path() {
   return Sage_Wrapping::$main_template;
 }
 
-function sage_sidebar_path() {
+function sidebar_path() {
   return new Sage_Wrapping('templates/sidebar.php');
 }
 
@@ -57,4 +61,4 @@ class Sage_Wrapping {
     return new Sage_Wrapping();
   }
 }
-add_filter('template_include', array('Sage_Wrapping', 'wrap'), 99);
+add_filter('template_include', array(__NAMESPACE__ . '\\Sage_Wrapping', 'wrap'), 99);
diff --git a/templates/header.php b/templates/header.php
index 99bc434..6656578 100644
--- a/templates/header.php
+++ b/templates/header.php
@@ -1,3 +1,5 @@
+<?php use Roots\Sage\Nav; ?>
+
 <header class="banner navbar navbar-default navbar-static-top" role="banner">
   <div class="container">
     <div class="navbar-header">
@@ -13,7 +15,7 @@
     <nav class="collapse navbar-collapse" role="navigation">
       <?php
         if (has_nav_menu('primary_navigation')) :
-          wp_nav_menu(array('theme_location' => 'primary_navigation', 'walker' => new Sage_Nav_Walker(), 'menu_class' => 'nav navbar-nav'));
+          wp_nav_menu(array('theme_location' => 'primary_navigation', 'walker' => new Nav\Sage_Nav_Walker(), 'menu_class' => 'nav navbar-nav'));
         endif;
       ?>
     </nav>
diff --git a/templates/page-header.php b/templates/page-header.php
index b1da4d3..92a58e4 100644
--- a/templates/page-header.php
+++ b/templates/page-header.php
@@ -1,5 +1,7 @@
+<?php use Roots\Sage\Titles; ?>
+
 <div class="page-header">
   <h1>
-    <?php echo sage_title(); ?>
+    <?php echo Titles\title(); ?>
   </h1>
 </div>
