- The Australian Prime Minister
- McDonalds Australia
- The Whitehouse
- Each member of the US House of Representatives (520 Drupal sites)
- The BBC
- Ubuntu
- The Cable News Network (CNN)
- Amnesty International
- Greenpeace
- The US National Aeronautics and Space Administration (NASA)
- The North Atlantic Treaty Organisation(NATO)
- The United Nations
- IBM recommends Drupal
- Popular Science
- America Online (AOL)
- Sun Microsystems
- Novell
- Harvard University
- Fedex
- Nike
- Warner Bros
- 20th Century Fox
- MacWorld
And many more - see this list of Drupal sites.
At last count Drupal powered over 1% of the internet.