Hans Hollen Nielsen (born 26 December 1959 in Arentsminde near Brovst, Denmark) is a former motorcycle speedway rider, active from the 1970s to the late 1990s; winning the world title four times.
During his career, Nielsen won a total of 22 World Championships, making him arguably the most successful speedway rider of all time.
Though unlike others such as fellow Danes Ole Olsen and Erik Gundersen, and New Zealand's Ivan Mauger, he never won the Long Track World Championship.