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 (c. 1140–1209), French poet
Rolando David Zárate Riga (born 1978), Argentine footballer
Stevie Riga (born 1989), French football player