diff --git a/.htaccess b/.htaccess
index 486edf4c..67e2d55d 100644
--- a/.htaccess
+++ b/.htaccess
@@ -7,6 +7,11 @@ DirectoryIndex index.php index.shtml index.html
 RewriteEngine On
 RewriteBase /
 
+########## Redirect to the canonical URL.
+
+RewriteCond %{HTTP_HOST} ^boost\.org [NC]
+RewriteRule ^.*$ http://www\.boost\.org%{REQUEST_URI} [R=301]
+
 ########## Rewrites to serve up dynamic RSS feeds.
 
 RewriteRule ^users/news/([-\w]+)$ users/news/entry.php/$1 [L]
diff --git a/development/.htaccess b/development/.htaccess
index b0bb25bc..e00b0f20 100644
--- a/development/.htaccess
+++ b/development/.htaccess
@@ -1,6 +1,11 @@
 RewriteEngine On
 RewriteBase /development
 
+# Redirect to the canonical URL.
+
+RewriteCond %{HTTP_HOST} ^boost\.org [NC]
+RewriteRule ^.*$ http://www\.boost\.org%{REQUEST_URI} [R=301]
+
 #~  Locally available regression result archives.
 RewriteRule ^tests$ tests/ [R]
 RewriteRule ^tests/([^/]+)/([^/]+)/$ tests/$1/$2/index.html [R]
diff --git a/doc/.htaccess b/doc/.htaccess
index d2dff707..98dd2546 100644
--- a/doc/.htaccess
+++ b/doc/.htaccess
@@ -1,6 +1,11 @@
 RewriteEngine On
 RewriteBase /doc
 
+# Redirect to the canonical URL.
+
+RewriteCond %{HTTP_HOST} ^boost\.org [NC]
+RewriteRule ^.*$ http://www\.boost\.org%{REQUEST_URI} [R=301]
+
 #~  RewriteRule ^wiki$ wiki/ [R]
 #~  RewriteRule ^wiki/(.*)$ wiki.php/$1 [L]
 RewriteRule ^html(/.*)?$ libs/release/doc/html$1 [R]