Leonidas is a neighborhood designation in the city of New Orleans. A subdistrict of the Uptown/Carrollton Area, its boundaries as defined by the New Orleans City Planning Commission are: South Claiborne Avenue, Leonidas and Fig Streets to the north, South Carrollton Avenue to the east, the Mississippi River and Jefferson Parish to the west. Although an official city planning district name, the name "Leonidas" is not widely used nor has it any historical usage and the area is usually referred to by the larger neighborhood "Uptown, or "Carrollton".

Fontainebleau and Marlyville are jointly designated as a neighborhood of the city of New Orleans. A subdistrict of the Uptown/Carrollton Area, its boundaries as defined by the New Orleans City Planning Commission are: Colapissa and Broadway Streets and MLK Boulevard to the north, Norman C. Francis Parkway, Octavia Street, Fontainebleau Drive, Nashville Avenue, South Rocheblave, Robert and South Tonti Street and Jefferson Avenue to the east, South Claiborne Avenue, Lowerline and Spruce Streets to the south and South Carrollton Avenue to the west.