The Platino Award for Best Supporting Actor in a Miniseries or TV series (Spanish: Mejor Interpretación Masculina de Reparto en Miniserie o Teleserie) 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).
The category was first introduced alongside the Platino Award for Best Supporting Actress in a Miniseries or TV series category in 2020 at the 7th Platino Awards. Argentine actor Gerardo Romano was the first recipient of the award for his role as Director Sergio Antín in El Marginal. No actor was won or has been nominated more than once to the award.
In the list below the winner of the award for each year is shown first, followed by the other nominees.