Warren Hamilton Widener (25 March 1938[1][2] – 25 June 2013) was a former Mayor of Berkeley, California, and former member of the Alameda County Board of Supervisors.

[6] After election in 1969 to a four-year term the Berkeley City Council, Widener, 33, ran for Mayor in 1971 against Vice-Mayor Wilmont Sweeney.

[9] In 1975, Berkeley Citizens' Action, a coalition of progressives, radicals and reformers, nominated Ying Lee Kelley to run against Widener.

Relying upon support of the liberal Berkeley Democratic Club, Widener defeated Kelley and Carl Finamore of the Socialist Workers Party.

[12] In 1988, Widener ran successfully for the District 5 seat on the Alameda County Board of Supervisors, succeeding John George, but was defeated by Keith Carson when he sought re-election in 1992.