Rehan Jahangir Poncha is an Indian swimmer, who specialized in backstroke, butterfly, and individual medley events. He is a 5-time Indian swimming champion, and a 6-time record holder in the butterfly. Poncha also set two of his records in the freestyle and medley relays at the 2009 Asian Swimming Championships in Foshan, China, along with his teammates Sandeep Sejwal, Virdhawal Khade, and Aaron D'Souza.
Poncha qualified for the men's 200 m butterfly at the 2008 Summer Olympics in Beijing, by clearing a FINA B-standard entry time of 2:01.40 from the Telstra Grand Prix in Sydney, Australia. He edged out Peru's Emmanuel Crescimbeni to take a second spot in heat 1 by 0.24 of a second in 2:01.89. Poncha failed to advance into the semifinals, as he placed fortieth overall in the preliminaries.