William Colridge Thompson Jr. (born July 10, 1953) is an American politician who served as the 42nd Comptroller of New York City; sworn into office on January 1, 2002, he was reelected to serve a second term that began on January 1, 2006. He did not seek re-election in 2009. Instead he ran for mayor, and he was succeeded as comptroller by John Liu. On June 15, 2016, Thompson was appointed by New York State Governor Andrew Cuomo as chairman of the board of trustees of The City University of New York; his term ends in June 2022.