Donkey Kong Jr. Math[a] is an edutainment platform video game developed and published by Nintendo for the Nintendo Entertainment System. It is a spin-off of the 1982 arcade game Donkey Kong Jr. In the game, players control Donkey Kong Jr. as he solves math problems set up by his father Donkey Kong. It was released in Japan in 1983 for the Family Computer, and in North America and the PAL region in 1986.

It is the only game in the Education Series of NES games in North America, owing to the game's lack of success. It was made available in various forms, including in the 2002 GameCube video game Animal Crossing and on the Virtual Console services for Wii and Wii U in 2007 and 2014 respectively. Donkey Kong Jr. Math was a critical and commercial failure. It has received criticism from several publications including IGN staff, who called it one of the worst Virtual Console games.

The game features two modes, one single-player and the allowing for one to two players. Its mechanics are similar to its predecessor, Donkey Kong Jr. The Calculate mode has Donkey Kong hold up a number, which players must attempt to reach by collecting a combination of digits and arithmetic symbols to eventually reach that number. Players must climb vines to reach these figures. The +−×÷ Exercise requires players to solve fixed math puzzles by climbing chains to reach the correct numbers and arithmetic symbols to do so.