Ryan Farnham "Buster" Parnell (c. 1934 – 17 September 2017) was an Irish jockey who competed in Flat racing.
Parnell was Irish flat racing Champion Jockey in 1969 and won three Irish Classic Races.
He subsequently served in the Royal Air Force before returning to horse racing and becoming champion jockey in Denmark.
His son, David Parnell, was also a jockey.
He died in Copenhagen in September 2017, aged 83.