Riga is a surname. Notable people with the surname include:
Ariel Silvio Zárate Riga (born 1973), Argentine footballer Bernardo Javier González Riga, Argentine palaeontologist Bill Riga (born 1974), American hockey coach José Riga (born 1957), Belgian football player and manager Petrus Riga ( 1140–1209), French poet Rolando David Zárate Riga (born 1978), Argentine footballer Stevie Riga (born 1989), French football player