蛙人（Frogman）泛指接受过特别的训练，能够浮潜以至水肺潜水，并且具有战斗能力的潜水员，特指军队、特种部队或者特种警察部队的水底行动人员。

蛙人一词约于1940年形成，指其行装具有光泽的服装，脚上有像是大蹼一样的设备。

A frogman is someone who is trained in scuba diving or swimming underwater in a tactical capacity that includes combat. Such personnel are also known by the more formal names of combat diver, combatant diver, or combat swimmer. The word frogman arose from Italian "uomo rana" around 1940 from the appearance of a diver in a shiny drysuit and large fins.