蟾胡鲇或胡鲶（学名：Clarias batrachus），**俗称土虱、土杀、泰国土虱、塘虱鱼，是辐鳍鱼纲鲇形目塘虱鱼科的其中一种。

本鱼原产亚洲湄公河、湄南河流域及马来半岛、印尼苏门答腊、婆罗洲、爪哇岛。并引入美国、日本、欧洲等地，但已造成部分地区的生态问题。国际自然保护联盟物种存续委员会的入侵物种专家小组（ISSG）列为世界百大外来入侵种。

The walking catfish (Clarias batrachus) is a species of freshwater airbreathing catfish native to Southeast Asia, but also introduced outside its native range where it is considered an invasive species. It is named for its ability to "walk" across dry land, to find food or suitable environments. While it does not truly walk as most bipeds or quadrupeds do, it has the ability to use its pectoral fins to keep it upright as it makes a sort of wiggling motion with snakelike movements. This fish normally lives in slow-moving and often stagnant waters in ponds, swamps, streams and rivers, flooded rice paddies or temporary pools which may dry up. When this happens, its "walking" skill allows the fish to move to other sources of water. Considerable taxonomic confusion surrounds this species and it has frequently been confused with other close relatives.