Gamage is a Sinhalese or Welsh surname. Notable people with the surname include:
Anoma Gamage, Sri Lankan politician Barbara Sidney, Countess of Leicester (1563–1621), Welsh heiress Chamila Gamage (born 1979), Sri Lankan cricketer Dharshana Gamage (born 1979), Sri Lankan cricketer Harry Gamage (1900–1994), American football coach Janak Gamage (born 1964), Sri Lankan cricketer K. A. Gamage (died 2009), Sri Lankan army officer Lahiru Gamage (born 1988), Sri Lankan cricketer Lal Dharmapriya Gamage, Sri Lankan architect and politician Lalith Gamage, Sri Lankan academic Lalith U. Gamage, Sri Lankan former provincial governor Piyasena Gamage (born 1949), Sri Lankan politician Saheli Rochana Gamage (born 1988), Sri Lankan singer Willy Gamage, Sri Lankan politician
See also Gamages, London department store Gammage (disambiguation)