John S. Gibson Jr. (August 11, 1902 – April 22, 1987) was an American politician, whose career spanned many decades and two states. A member of the Democratic Party from San Pedro, Gibson served on the Los Angeles City Council for the 15th district from 1951 and 1981, and did two lengthy stints as its president. Earlier in his life, Gibson's tenure as Mayor of Geneseo, Kansas made him the youngest elected mayor in the nation at the time.