A third rail is an extra rail used for supplying electricity to trains.
Third rail may also refer to:
Third rail (politics), a political metaphor Third Rail, a supporters' group for New York City Football Club
Railroading The extra rail on a dual gauge railway Guard rail (rail transport), used to prevent a train from derailing. Third rail (model rail), in rail transport modelling, used for easier wiring The Third Rail (magazine), an online magazine about transportation
Music and Entertainment Emergency Third Rail Power Trip, a 1983 album by Rain Parade The Third Rail (band), an American pop group The Third Rail (album), a 1996 album by Railroad Jerk "Third Rail" (song), a 1993 song by Squeeze Third Rail (TV series), a Singaporean TV drama series Third Rail Releasing, a film distribution banner of The Weinstein Company
See also Three-cushion billiards, also called "three-rail"