Busy Bee was a British automobile manufacturer that operated briefly from 1922 to 1923. Founded by Joseph Mills in Mansfield, Nottinghamshire, the company specialized in the production of light three-wheeled vehicles.

The Busy Bee monocar was powered by a 5-horsepower single-cylinder Stag engine, which provided adequate performance for its intended use. It featured a two-speed gearbox and utilized chain drive for its propulsion. The vehicles were built to order, catering to specific customer requirements during its short production run.

Despite its limited time in the automotive market, Busy Bee contributed to the early development of three-wheeled vehicles in the United Kingdom.