Jim Cassidy (born 21 January 1963) is a New Zealand jockey and has been acknowledged in the Australian Racing Hall of Fame. Cassidy rode Kiwi from last into the straight to win the 1983 Melbourne Cup. He won his second Melbourne Cup in 1997 aboard Might and Power whom he also rode to victory in the following year's Cox Plate.
Cassidy has won the Australian Derby three times; in 1990, 1993 and in 2009.
Cassidy is the third jockey to win 100 group one races. Cassidy's 100th win was aboard Zoustar in the Coolmore Stud Stakes (1200m) at Flemington on Saturday 2 November 2013.
Jim Cassidy released his autobiography entitled Pumper through Macmillan Books in October 2016.