The Platino Award for Best Supporting Actor (Spanish: Premio Platino al mejor actor de reparto/Premio Platino a la mejor interpretación masculina de reparto) is one of the Platino Awards, Ibero-America's film awards presented annually by the Entidad de Gestión de Derechos de los Productores Audiovisuales (EGEDA) and the Federación Iberoamericana de Productores Cinematográficos y Audiovisuales (FIPCA).
It was first presented in 2021, with Chilean actor Alfredo Castro being the first recipient, for his role at "The Stallion" in The Prince. Prior to that, supporting male performances were included in the Best Actor category.
Alfredo Castro also received the award the first two years it was presented being the only multiple winner in te category to date as well as the only actor with multiple nominations for the award with two.
In the list below the winner of the award for each year is shown first, followed by the other nominees.