Gaddam (Telugu: గడ్డం) is a Telugu surname. Variants of the surname include Gadam, Gaddamu, Geddam, and Geddamu. Notable people with the surname include:
Gadam Samuel Luke (1920–2000), Indian bishop Gaddam Ganga Reddy (1933–2017), Indian politician Gaddam Padmaja Reddy (born 1967), Indian Kuchipudi exponent Gaddam Prasad Kumar (born 1964), Indian politician Gaddam Ram Reddy (1929–1995), Indian professor Gaddam Ranjith Reddy (born 1964), Indian politician Gaddam Sammaiah (born 1958), Indian theatre artist Gaddam Vamsi Krishna (born 1989), Indian politician Gaddam Venkatswamy (1929–2014), Indian politician Gaddam Vinod Kumar (born 1956), Indian politician Gaddam Vivekanand (born 1957), Indian politician Geddam Srinivas Naidu (born 1969), Indian politician