Ermindo Angel Onega (born 30 April 1940; died 21 December 1979) was an Argentine footballer, offensive midfielder and forward from River Plate. He played for River Plate from 1957 to 1968, 222 matches making 98 goals. In 1972 he played for Club Atletico Velez Sarsfield in 30 matches making 6 goals.
Onega also had spells with Penarol in Uruguay and La Serna in Chile.
Onega was the older brother of Daniel Onega, also a River Plate footballer.
Onega died in a road accident in 1979 on his way to the Argentine holiday resort of Mar del Plata, he was only 39 years old.