Raul Marco Sison (Tagalog pronunciation: [ˈsisɔn]; born July 10, 1957) is a Filipino singer, actor, and politician.

Sison has been part of the touring group called The Greatest Hitmakers composed of veteran OPM artists Rico J. Puno, Hajji Alejandro and Rey Valera.

Aside from his hit-making albums, Sison also joined popular singers Rico J. Puno, Rey Valera and Nonoy Zuñiga, collectively known as the Hitmakers.

The album has been preceded by other newly written songs by Vehnee Saturno like Selos, Kahit Na Minsan Pa, Sa Iisang Puso Mo and Kwento.

[7] He initially planned to run for vice governor of Laguna in 2001 but decided to instead retire from politics and give way to Board Member Dan Fernandez, who would go on to win the election.

One of his grandsons, Alain's son and teenage actor Andrei Sison, died in a car accident in Quezon City on March 24, 2023.