The Lincoln Nautilus is a mid-size luxury crossover SUV marketed and sold by the Lincoln brand of Ford Motor Company. The Nautilus was initially renamed from the MKX as part of a mid-cycle update in 2018 for the 2019 model year, as Lincoln phased out its use of "MK" model names. The name 'Nautilus' is derived from the ancient Greek word nautes, meaning "sailor," as in nautical or astronaut.

Lincoln Motor Company, or simply Lincoln, is the luxury vehicle division of American automobile manufacturer Ford Motor Company. Marketed among the top luxury vehicle brands in the United States Lincoln is positioned closely against its General Motors counterpart Cadillac. However, beginning with the 2021 model year, they only offer SUV and crossover vehicles.