The Continental O-240 engine is a four-cylinder, horizontally opposed, air-cooled aircraft engine that was developed in the late 1960s for use in light aircraft by Continental Motors, Inc.

[1][2] The 130 hp (97 kW) O-240 was a new engine design derived from the six-cylinder Continental O-360 and introduced in 1971.

It is generally similar in overall dimensions to the Continental O-200, but with a higher 8.5:1 compression ratio, designed to run on 100/130 avgas.

[3][4] The O-240 was produced under license in the United Kingdom by Rolls-Royce Limited and was used to power the Reims-Cessna FRA150 Aerobat, a more powerful aerobatic model of the Cessna 150 constructed in France by Reims Aviation under license.

The A and B versions differ only in the type of fuel injector used.