Agustín Mario Cejas (22 March 1945 – 14 August 2015) was an Argentine football goalkeeper.

Cejas joined the Racing Club youth team in 1959 at the age of 13.

In 1973, Cejas helped Santos to win the Campeonato Paulista and received the prestigious Bola de Ouro as the best player in Brazil.

Cejas returned to Argentina in 1975 for a brief spell with Club Atlético Huracán before going back to Brazil to join Grêmio.

He then had a short spell with River Plate where he was part of the squad that won the Nacional in 1981.