Robert Hauschild Liebeck is an American aerodynamicist, professor and aerospace engineer. Until retiring from his position as senior fellow at the Boeing Company. in 2020, he oversaw their Blended Wing Body ("BWB") program. He has been a member of the National Academy of Engineering since 1992, where he is an AIAA Honorary Fellow, the organization’s highest distinction. He is best known for his contributions to aircraft design and his pioneering airfoil designs known as the "Liebeck Airfoil". Since his retirement he remains active in aviation industry associations and continues to teach at UCI.

A blended wing body (BWB), also known as blended body, hybrid wing body (HWB) or a lifting aerofoil fuselage, is a fixed-wing aircraft having no clear dividing line between the wings and the main body of the craft. The aircraft has distinct wing and body structures, which are smoothly blended together with no clear dividing line. This contrasts with a flying wing, which has no distinct fuselage, and a lifting body, which has no distinct wings. A BWB design may or may not be tailless.