Sebastian Xavier (born 10 February 1970) is a former Indian swimmer from Kerala.

He was the fastest swimmer of India for more than a decade.

He held the national record of 22.89 seconds in 50 meters freestyle swimming for 11 years from 1998 to 2009 [1][2] in addition to several other national records during his career.

Sebastian won 36 gold medals at the SAF Games, SAF Championships and Asia Pacific meets and 66 gold medals in the national meets.

[4] Sebastian is married to former Indian athlete Molly Chacko and the couple works with Southern Railways.