Atago (愛宕) was the second vessel in the Takao-class heavy cruisers, active in World War II with the Imperial Japanese Navy (IJN). These were among the largest and most modern cruisers in the Japanese fleet, designed with the intention to form the backbone of a multipurpose long-range strike force. Her sister ships were Takao, Maya and Chōkai.

The Takao-class cruiser (高雄型) was a class of four heavy cruisers of the Imperial Japanese Navy (IJN) launched between May 1930 and April 1931. All served during World War II.