March 20, 2009 (Friday)
- The United States Navy's USS Hartford and USS New Orleans collide in the Strait of Hormuz. (CNN) (US Navy)
- Somali pirates hijack the Greek cargo ship MV Titan. (CNN)
- A bomb severely damages a government building in Athens, Greece. (Reuters)
- The Fermi National Accelerator Laboratory discovers Y(4140), a new subatomic particle. (National Geographic)