Ruben Matias Cayari (July 25, 1923 – April 7, 1994), professionally known as Ruben Rustia, was a Filipino actor and screenwriter. He is best known for his portrayal of President Ferdinand Marcos in the 1988 Australian miniseries A Dangerous Life. He won the FAMAS Award for Best Supporting Actor for his performance in the 1954 fantasy film Pedro Penduko, and was later nominated for four more times in the same category as well as for Best Actor and Best Screenplay.