Battle Fever J (バトルフィーバーJ（ジェー）, Batoru Fībā Jei) is a live-action tokusatsu TV series. The third entry of the Super Sentai series franchise, Battle Fever J was produced by Toei Company in partnership with American comic book publisher Marvel Comics. A total of 52 episodes aired on TV Asahi from February 3, 1979, to January 26, 1980, following J.A.K.Q. Dengekitai and being followed by Denshi Sentai Denjiman.

The team have codenames named for countries around the world, also respectively named in their theme song: Battle France, Battle Cossack (Soviet Union), Battle Kenya, Miss America (United States) and Battle Japan. It marks the first appearance of a Black and Orange Ranger in the franchise. It was also the first series in the Super Sentai franchise where the heroes must control giant robots to defeat a monster who itself has grown to a gigantic size. Toei's tokusatsu adaptation of Spider-Man was the first to introduce this format and was also the inspiration for this and the subsequent entries in the Super Sentai series. The series was also partially inspired by the Marvel Comics character Captain America.

Battle Fever J was the first series to use the term Super Sentai (unlike the previous two who were just called Sentai, without the “Super”) until Toei announced in 1995 that its predecessors Himitsu Sentai Gorenger and J.A.K.Q. Dengekitai were also part of the Super Sentai series, when Chouriki Sentai Ohranger was announced as the 19th Super Sentai team.