As well as single seater racing, Regazzoni participated in sports car racing, including the 1970 24 Hours of Le Mans where he and Arturo Merzario raced a Ferrari 512S.
Ademais de carreiras de monoplazas, Regazzoni participou en carreiras de resistencia, incluíndo as 24 Horas de Le Mans de 1970, onde el e Arturo Merzario correron cun Ferrari 512S.