水底曲棍球(Underwater hockey / Octopush)，简称水曲，是一种于游泳池内进行的集体球类运动，与水球(Water polo)一样，是属于水上运动之一；同时亦是曲棍球(Hockey)的其中一种。

用球方面，与冰上曲棍球和单线滚轴溜冰曲棍球(Inline hockey)一样，是用一个名为"Puck"的硬化橡胶圆盘射入球场两边的敌方球门区而得分。

至于用球棍方面，则使用名为较短的曲棍球棍棒进行传球、运球和射门。

Underwater Hockey (UWH), (also called Octopush (mainly in the United Kingdom)) is a globally played limited-contact sport in which two teams compete to manoeuvre a puck across the bottom of a swimming pool into the opposing team's goal by propelling it with a pusher. It originated in England in 1954 when Alan Blake, the founder of the newly formed Southsea Sub-Aqua Club, invented the game he called Octopush as a means of keeping the club's members interested and active over the cold winter months when open-water diving lost its appeal. Underwater Hockey is now played worldwide, with the Confédération Mondiale des Activités Subaquatiques, abbreviated CMAS, as the world governing body. The first Underwater Hockey World Championship was held in Canada in 1980 after a false start in 1979 brought about by international politics and apartheid.