Warin Chamrap (Thai: วารินชำราบ, pronounced [wāː.rīn tɕʰām.râːp]; Northeastern Thai: วารินซำราบ, pronounced [wa᷇ː.li᷇n sa᷇m.lâːp]) is a district (amphoe) in the western part of Ubon Ratchathani province, northeastern Thailand (Isan).

Neighboring districts are (from the north clockwise) Mueang Ubon Ratchathani, Sawang Wirawong, Na Yia, Det Udom, Samrong of Ubon Ratchathani Province, and Kanthararom of Sisaket province.

Warin Chamrap is located just 2 kilometers (1 mi) from Mueang Ubon Ratchathani, with Mun River between them.

The district is divided into 16 sub-districts (tambons), which are further subdivided into 185 villages (mubans).

Missing numbers are tambon which now form the districts Samrong and Sawang Wirawong.