Maria Rosario Silayan-Bailon better known as Chat Silayan (July 8, 1959 - April 23, 2006) was a Filipina beauty queen and actress. She won the 1980 Binibining Pilipinas Universe crown and became the third runner-up at Miss Universe 1980. A year after her stint in Miss Universe, her acting career began and she became one of the most popular and acclaimed actresses in the Philippines. She was the daughter of theatre and movie actor Vic Silayan and the aunt of Victor Silayan.