Walter Edwin "Walt" Hansgen (October 28 1919 - April 7 1966) was a driver from the United States. A veteran of World War II, after the war he was a notable test driver and successful road racing driver in the US, including four wins in the SCCA National Championships. Hansgen entered five Formula 1 races, qualifying in two, both at Watkins Glen. In 1964, he finished fifth in a factory Lotus-Climax, scoring two points.
Hansgen was driving a 7-liter Ford GT40 in the rain at spring testing for the 24 Hours of Le Mans on April 3, 1966, when the car started to aquaplane. Reports say that he tried to steer the car up an escape road, only to find a new barrier in place for spectator safety. Hansgen was first taken to a hospital in Le Mans, then transferred to one with an advanced neurological ward in Orleans, where he died, four days later.