Thomas Ong Thian Chai (born 1 February 1969) is a Singaporean actor, television host and businessman.

Ong was a flight steward with Singapore Airlines before entering the entertainment industry.

He joined the newly formed Television Corporation of Singapore in 1994 and made his debut in Dr Justice.

More recently he returned to MediaCorp for the fourth time and signed a three-year contract in early 2012.

[1] In January 2020, Ong announced his retirement from the entertainment industry.