Rainy Creek is a creek in the Moira River and Lake Ontario drainage basins in Addington Highlands, Lennox and Addington County, Ontario, Canada.
Rainy Creek begins in an unnamed marsh at an elevation of , north of Grimsthorpe Lake on the sister tributary of the Skootamatta River, Partridge Creek. It flows south before turning east for the remainder of its course.The creek reaches Rainy Lake at an elevation of , and enters Bon Echo Provincial Park. The creek reaches its mouth at the Skootamatta River at an elevation of , between Joeperry Lake and Pearson Lake and about northwest of the community of Cloyne.