Jason Cask (born 7 February 1971) is a former professional tennis player from Australia.

Cask, who was coached by Terry Rocavert, made the quarter-finals of the boys' singles at the 1988 Australian Open and was a boys' doubles semi-finalist at the 1989 Australian Open (with William O'Neil).

[2] He first attempted qualification for the men's draw in 1988 and continued to participate in the qualifiers every year without success, until he received a wild card into the 1992 Australian Open.

[3] In the first round he faced American 15th seed David Wheaton and lost in straight sets.

[3] During the 1991 ATP Tour season, Cask took part in the Queensland Open and made it to the second round, beating Neil Borwick.