The Buzuluk () is a river in Volgograd Oblast, Russia. It is a left tributary of the Khopyor, and is long, with a drainage basin of . It has its sources on the westernmost slopes of the Volga Upland. During dry periods the upper reaches of the river dry up completely.
The town of Novoanninsky and the stanitsa of Preobrazhenskaya lie along the river.
The word is formed from the (; ; ; ) means "calf", -lik suffixes refers that it belongs to something. According to another version, the word is formed from the Turkic buz (; ; ; ) literally means "ice".