Roysyn (foaled 24 October 1992) is a Thoroughbred racehorse who won the New Zealand Derby in 1995.
Roysyn gave trainer Roger James his second Derby win (his first being Tidal Light when in partnership with Jim Gibbs), and rider Vinny Colgan the first of his six Derby wins.
He was a changed horse when the 1995 Derby came around, beating Clear Rose and favourite Interval to record a slight upset victory.
But he proved it was no fluke result later in the season, winning the Wellington Stakes and then his second Group 1 race in the Trackside Sales Stakes against older horses.
He finished a disappointing tenth when one of the favourites in the Auckland Cup and was unable to rediscover his best form when lightly raced in the last two years of his career.