乌鳢（学名：Channa argus），又名北方蛇头鱼、黑鱼、生鱼、乌鱼、乌棒、蛇头鱼、文鱼和才鱼，属鳢科鳢属，在中国是一种常见的食用鱼。

乌鳢有雄性大于雌性的现象，一般成年乌鳢的体长约在40至70公分之间，不过有些大型乌鳢的体长长达80公分以上，目前为止发现最大的乌鳢有接近1.5公尺之长（也有人说是1.2公尺），重达15磅（7公斤左右），据说是在俄罗斯被发现的。

The northern snakehead (Channa argus) is a type of snakehead fish native to China, Russia, North Korea, and South Korea. In Europe, the first report of the species was from Czechoslovakia (now the Czech Republic) in 1956. In the United States, the fish is considered to be a highly invasive species. In a well-known incident, several were found in a pond in Crofton, Maryland, in June 2002, which led to major media coverage and two movies. Sightings have been reported at Central Park in Burnaby, BC.