Bolsovcr Bros Ltd was a British automobile manufacturer based in Eaglescliffe, County Durham, that operated from 1907 to 1909. The company specialized in the production of steam-powered vehicles, leveraging over a decade of experience in adapting steam technology for automotive use.

The Bolsovcr steam car was designed as a two-seater vehicle, featuring a three-cylinder poppet valve engine located at the front and a semi-flash boiler positioned beneath the seat. Although the primary model utilized a three-cylinder engine, advertisements also referenced a four-cylinder variant. The vehicle employed a shaft drive system that connected directly from the crankshaft to the rear axle, enhancing its performance. It utilized paraffin as fuel and was constructed with a frame made of armored ash wood, reflecting the engineering practices of the time.

Despite its innovative design, Bolsovcr Bros Ltd had a brief production run, ceasing operations in 1909. The company's contributions to early automotive engineering, particularly in steam propulsion, remain a notable part of the history of British motoring.