Ryan Geoffrey Sullivan is a former Australian international motorcycle speedway rider who has won the Australian Solo Championship, Australian Under-21 Speedway Championship, and Under-16 championships during his career. Sullivan achieved a career best third in the 2002 Speedway Grand Prix, winning two of the ten Grand Prix run during the year.

The Australian Individual Speedway Championship historically known as the Australian Solo Championship is a motorcycle speedway championship held each year to determine the Australian national champion. It is organised by Motorcycling Australia (MA) and is the oldest continuously running national speedway championship in the world, having been run since 1926 with the exception of 1942-1945 when racing was suspended during World War II and 1955-1961 when the championship was not held.