Timok (Cyrillic: Тимок, Romanian: Timoc) is a river in eastern Serbia and western Bulgaria.

Timok may also refer to: Timok Valley, a region in Serbia around the river FK Timok Zaječar, Serbian football club Tributaries of Timok river: Beli Timok Trgoviški Timok Svrljiški Timok Crni Timok