Firth is a surname. Notable people with the surname include:
Charles Firth (comedian), Australian comedian
Charles Firth (coach), former head coach
Charles Harding Firth, British historian
Colin Firth (born 1960), British actor
David Firth, British animator
Everett Firth, American timpanist
Harry Firth (born 1918), Australian racing driver and race team manager
J. R. Firth, British linguist
John Firth, British cricketer
Jonathan Firth, British actor
Joseph Firth, New Zealand educator
Josiah Firth, New Zealand farmer
Malaika Firth, Kenyan and British model
Mark Firth, British steel magnate
Nicholas Firth, music business executive
Peter Firth, British actor
Shirley Firth (1953–2013), Canadian cross-country skier
Raymond Firth, New Zealand anthropologist
Will Firth (born 1965), Australian literary translator
