The BTR-4 "Bucephalus" is an amphibious 8×8 wheeled infantry fighting vehicle (IFV) designed in Ukraine by the Kharkiv Morozov Machine Building Design Bureau.

Kharkiv Morozov Machine Building Design Bureau, often simply called Morozov Design Bureau or abbreviated KMDB, is a state-owned Ukrainian company in Kharkiv which designs armoured vehicles, including the T-80UD and T-84 main battle tanks, as well as military prime movers. It was responsible for designing and creating many important Soviet-era armoured fighting vehicles, including the BT tank series, with its most famous designs being the T-34, T-54, and T-64 tanks. It is closely associated with the Malyshev Factory.