The 1935 Labor Day Hurricane was an extremely powerful and devastating Atlantic hurricane that struck the southeastern United States in early September 1935. For several decades it was: the most intense Atlantic hurricane on record in terms of barometric pressure, until surpassed by Hurricane Gilbert in 1988; the strongest Atlantic hurricane on record in terms of 1-minute sustained winds, until surpassed by Hurricane Allen in 1980; and the strongest at landfall by 1-minute sustained winds, until it was tied by Hurricane Dorian in 2019. The fourth tropical cyclone, third tropical storm, second hurricane, and second major hurricane of the 1935 Atlantic hurricane season, it is one of four Category 5 hurricanes on record to strike the contiguous United States, along with Hurricane Camille (1969), Hurricane Andrew (1992), and Hurricane Michael (2018).

An Atlantic hurricane is a type of tropical cyclone that forms in the Atlantic Ocean primarily between June and November. The terms "hurricane", "typhoon", and "cyclone" can be used interchangeably to describe this weather phenomenon. These storms are rotating, organized systems of clouds and thunderstorms that originate over tropical or subtropical waters and have closed low-level circulation, not to be confused with tornadoes. They form over low pressure systems. In the North Atlantic, central North Pacific, and eastern North Pacific, the term "hurricane" is mainly used, whereas "typhoon" is more commonly used for storms originating in the western North Pacific. The term "cyclone" is used in the South Pacific and Indian Ocean.