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Hans Hollen Nielsen (born 26 December 1959) is a Danish former professional motorcycle speedway rider. He competed in the Speedway World Championships from 1977 to 1999. Nielsen is notable for winning four Speedway World Championship titles. During his career, he 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. In 2012, Nielsen was named an FIM Legend for his motorcycling achievements.