The Ralt RT4 is an open-wheel formula racing car, designed, developed and built by Ralt, for Formula Atlantic (and was also occasionally raced in Formula Two categories), in 1980. It was later converted into a closed-wheel prototype, and used in the revived Can-Am series, between 1982 and 1985, where it achieved only modest success. In Can-Am copetition the car achieved 1 podium finish, 1 class victory and a best result of a 2nd-place finish.