Mazie Keiko Hirono (メイジー・ヒロノ, Meijī Hirono?, Japanese name: 広野 慶子 Hirono Keiko, born November 3, 1947) is the U.S. Representative for Hawaii's 2nd congressional district, serving since 2007. She is a member of the Democratic Party.
She was the second Asian immigrant elected lieutenant governor of a state of the United States. She ran against Linda Lingle for governor of Hawaii in 2002, one of the few gubernatorial races in United States history where two major parties nominated women to challenge each other. She considers herself a non-practicing Buddhist, and is often cited with Hank Johnson (D-Georgia), as the first Buddhist to serve in the United States Congress. She is the third woman to be elected to Congress from the state of Hawaii (after Patsy Mink and Pat Saiki). On May 19, 2011, Hirono announced her candidacy for the U.S. Senate seat left open by Senator Daniel Akaka. She will face Ed Case in the Democratic primary, setting up a rematch of the 2002 Democratic primary for Governor, in which she defeated him by a 1% margin (though a few weeks later, she lost to Lingle in the general election.)