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The McDonnell Douglas DC-10 Twin was a proposed version of the DC-10, a wide-body trijet airliner, except with only two engines instead of three. It was designed to be lighter, simpler, and more fuel-efficient than the original DC-10, and to compete with the Airbus A300, the first twin-aisle twinjet. However, the DC-10 Twin did not enter production, as there was not enough demand from airlines, Beginning in 1966, two-engine designs were studied for the DC-10 before the design settled on the three-engine configuration. Later on, a big twin based on the DC-10 cross-section was proposed to Airbus as a 50/50 venture but rejected. In 1971, a shortened DC-10 version with two engines was proposed as a competitor to the Airbus A300,

McDonnell Douglas held a major presentation of the proposed DC-10 Twin at Long Beach, and several European airlines were willing to place orders. On July 30, 1973 however, the company's board decided not to give the proposed twin the go-ahead, as no US airline had ordered it. More DC-10 Twin proposals were made, either as a collaboration with a European manufacturer or as a solely McDonnell Douglas product, but none proceeded beyond design studies.