OJ Mariano (born 1981 or 1982) is a Filipino singer. He is the second runner-up of the second season of ABS-CBN's reality singing competition Star in a Million. After the competition, he released an album under Star Records entitled One Dream Come True. For his first album, he received Awit Awards' 2006 "Best New Male Recording Artist". He is currently performing as a singer in ABS-CBN's The Singing Bee.