3D Tetris is a puzzle video game developed by Technology and Entertainment Software and published by Nintendo. It was initially released for the Virtual Boy on March 22, 1996, in North America only. The game allows players to control multiple falling blocks, rotating and positioning them to clear layers in a "Well". The game is similar to other Tetris games, but uses a three-dimensional playing field as opposed to the traditional two-dimensional view. The game contains multiple modes and gametypes, as well as different difficulty settings and levels, which change different aspects of the gameplay.

Parts of 3D Tetris, such as the blocks, are rendered as 3D wire-frame models. A version of the game entitled Polygo Block (ポリゴブロック Porigo Buroku), meaning literally Polygonal Block, was to be released in February 1996 in Japanese markets, but never emerged. The game received mostly negative reviews.