Rolls-Royce plc is a British aircraft engine maker, and the largest in the world. The company has related businesses in the defence aerospace, marine and energy markets.
Rolls-Royce was nationalised in 1971, by which time aircraft engines had long been the most significant part of the business. The automobile company was separated in 1973 and the present Rolls-Royce plc was re-privatised in 1987. Rolls-Royce is, through its defence aerospace division, the world's 16th largest defence contractor.