Matsui personally donated $500,000 towards charity relief for victims of the 2004 Indian Ocean earthquake. He also donated $620,000 to relief efforts for victims of the earthquake and tsunami of 2011 in the Tōhoku region of Japan. On March 21, 2015, Matsui and former teammate Derek Jeter held a baseball charity event to support children affected by the 2011 earthquake and tsunami, at the Tokyo Dome. The event included a baseball clinic and a home run derby between Matsui and Jeter.