Mario Power Tennis, is a sports game developed by Camelot Software Planning and published by Nintendo. The game is the sequel to the Nintendo 64 title Mario Tennis, and is the fourth game in the Mario Tennis series.

Power Tennis incorporates multiple characters, themes, and locations from the Mario series. The game includes standard tennis matches, but contains variants that feature different scoring formats and objectives. Other variants include "Gimmick" courts, thematic areas with components and properties that directly affect gameplay. The game has 18 playable characters, each categorised by their style of play and each with a pair of unique moves known as "Power Shots". Power Tennis was developed simultaneously with Mario Golf: Toadstool Tour, and the pair shared similar technology and concepts with each other during production. Such similarities include an emphasis on the Mario theme in characters and settings as well as alternative game modes such as "Ring Shot".