The Beli Timok (Serbian Cyrillic: Бели Тимок, "White Timok") is a headwater of the Timok River in Serbia. It starts at the junction of the Svrljiški Timok River and the Trgoviški Timok River, in Knjaževac. It was also known as Knjaževački Timok (Књажевачки Тимок, "Timok of Knjaževac").