May 25, 2009 (Monday)
- Nine United Kingdom Cabinet ministers have been implicated in Parliament's expenses scandal. (RTÉ)
- Tsakhiagiin Elbegdorj of the Democratic Party is elected as President of Mongolia. (BBC)
- North Korea conducts its second nuclear test. (ABC News Australia)
- Singapore's consumer price index decreased by 1.5% in April, its largest recorded decline. (Reuters)
- Somali President Sharif Ahmed requests international aid in combating Islamic militants. (CNN)
- The Space Shuttle Atlantis completes the final servicing mission to the Hubble Space Telescope.