Oyarzabal is a Basque surname. Notable people with the surname include:
Antonio de Oyarzabal (born 1935), Spanish diplomat and politician Gloria Oyarzabal (born 1971), Spanish visual artist and teacher Hugues Oyarzabal (1985–2025), French surfer Iñaki Oyarzabal (born 1966), Spanish politician Isabel Oyarzábal Smith (1878–1974), Spanish journalist, writer, actress and diplomat José Ramón Oyarzábal (born 1957), Spanish rower José Oyarzabal (French rower) (born 1970), French rower Mario Oyarzabal (born 1969), Argentine jurist, diplomat and professor Mikel Oyarzabal (born 1997), Spanish footballer