Ralph Sidney Locher (July 24, 1915 – June 18, 2004) was a Romanian-born American politician of the Democratic Party who served as the 50th mayor of Cleveland, Ohio.

In 1965, Locher banned all rock concerts at Public Hall and other city-owned venues following a near-riot at a Rolling Stones performance.

On April 25, 1967, Locher declared that three recent visitors to the city – Floyd McKissick, national director of the Congress of Racial Equality (CORE), Alabama governor George C. Wallace, and civil rights leader Martin Luther King Jr. – were "extremists.

Stokes went on to defeat Republican Seth Taft in the general election, becoming the first African American mayor of a major U.S. city.

Though a Democrat, he became increasingly conservative as he got older and with longevity in office frequently voting with Republican justices on worker's compensation and other employment issues.