Firth is a Scottish word for a coastal water body. It may also refer to:
Places Canada Firth River, a major river in Yukon, Canada
England Firth Park (ward), an electoral ward in the City of Sheffield
Scotland Firth, Orkney Firth, Shetland
United States Firth, Idaho, United States Firth, Nebraska, United States
Other uses Firth (surname) Vic Firth Company, American percussion instrument manufacturing company Firth, Pond & Company, American music company "Firth of Fifth", song by British rock band Genesis, the title being a pun on the Firth of Forth in Scotland
See also Frith