The Opel Omega is a executive car engineered and manufactured by German automaker Opel between 1986 and 2004. The first generation, the Omega A (1986–1994), superseded the Opel Rekord. It was voted European Car of the Year for 1987, and was available as a saloon or estate. The second generation, the Omega B, was manufactured from 1994 to 2004.

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.