Jaak Van Velthoven (24 January 1951^[1]) is a Belgian former professional motocross racer.^[2] He competed in the Motocross World Championships from 1970 to 1983.

Van Velthoven was born in Lommel, Belgium. His best individual performance was a third place in the 500cc World Championship in 1973 with the Yamaha factory racing team.^[3][4] He helped Yamaha develop a revolutionary motorcycle rear suspension that used a single shock absorber (invented by the Belgian engineer Lucien Tilkens)^[5] instead of the traditional dual shock absorbers.

Van Velthoven also rode for the Husqvarna and KTM factory racing teams. He was a member of four winning Belgian teams at the Motocross des Nations in 1972, 1973, 1976 and 1977. Standing well over 6 feet tall, it was not difficult to distinguish him in the pack and he was often referred to as 'Long tall Jaak'.