The Lancia Thema is an executive car produced by the Italian automaker Lancia between 1984 and 1994, and one of four cars to share the Type Four platform alongside the Alfa Romeo 164, Fiat Croma and Saab 9000. The Thema was first shown in Turin Motor Show in 1984.

Executive car is a British term for a large car which is equivalent to the European E-segment and American full-size classifications. Executive cars are larger than compact executive cars, and smaller than luxury saloons / full-size luxury sedans.