John Thomas Alsop Jr. (August 10, 1874 – May 12, 1958) was an American politician. He served as Mayor of Jacksonville, Florida, from 1923 to 1937, and again from 1941 to 1945. His eighteen-year, seven term stint in the mayor's office is the longest in the city's history. Jacksonville's Main Street Bridge, officially the John T. Alsop Jr. Bridge, is named for him.

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• Keeping the Faith: Race, Politics, and Social Development in Jacksonville, Florida, 1940-1970
• St. Petersburg Times - Google News Archive Search