Giger is a surname. Notable people with the surname include:
Albert Giger (born 1946), Swiss cross-country skier
Fabrice Giger (born 1965), Swiss publisher and film producer
H. R. Giger (1940–2014), Swiss painter, sculptor, and set designer
Paul Giger (born 1952), Swiss violinist and composer
Peter Giger (born 1939), Swiss percussionist and bandleader
Walter Giger (born 1943), Swiss environmental chemist
Werner Giger (1949–1974), Swiss motorcycle racer