Mercury Marine, founded in 1939 as Kiekhaefer Mercury, is a division of the Brunswick Corporation. It is based in Fond du Lac, Wisconsin. The company manufactures marine engines.

Mercury Marine's primary business is outboard motors. Mercury Outboards, 30 Hp and less, are made by Tohatsu in Japan. Mercury Marine builds 40, 50 and 60 horsepower outboard motors in Suzhou, China. Mercury also manufactures engines over 75 horsepower at its facility in Fond du Lac in Wisconsin.