|Etymology||Possibly from Bengali তিতা (tita), meaning "bitter" or "wet"|
|Native name||তিতাস (Bengali)|
|Bay of Bengal via the Meghna River|
|Length||98 kilometres (61 mi)|
|River system||Surma-Meghna River System|
The Titas River (Bengali: তিতাস Titāsa; also Romanized Titash) is a transboundary river that merges into the Meghna river and forms part of the Surma-Meghna River System. Titas starts its journey from the Tripura State, with Haora as one of its right tributaries. The river is 98 kilometres (61 mi) long and joins Meghna river near Ashuganj, Brahmanbaria. Bangladesh's first Y-shaped bridge is over this river connecting Comilla and Brahmanbaria.
Titas Gas, the biggest natural gas reserve of Bangladesh located in Brahmanbaria, which supplies gas to capital Dhaka, is named after this river. One of the offshoots of the Meghna river is also named as the Titas which branches out from the Meghna at Chatlapur and again meets the Meghna at Nabinagar Upazila The river has become narrow and shallow in many places due to siltation.
Titash Ekti Nadir Naam (A River Called Titas) is a 1956 novel by Bengali writer Adwaita Mallabarman and adapted into the 1973 film of the same name by Ritwik Ghatak. It is a depiction of the lives of a fishing community dependent on the Titas River.