Clarence Raymond Joseph Nagin Jr. is an American former politician who was the 60th Mayor of New Orleans, Louisiana, from 2002 to 2010. A Democrat, Nagin became internationally known in 2005 in the aftermath of Hurricane Katrina.

The post of Mayor of the City of New Orleans has been held by the following individuals since New Orleans came under American administration following the Louisiana Purchase — the 1803 acquisition by the U.S. of 828,800 square miles (2,147,000 km2) of the French province La Louisiane. In all mayoral elections since 1930, New Orleans has used a two-round system with a preliminary round and a runoff if no candidate reached a majority in the first round. All mayors of New Orleans since 1872 have been Democrats.