Percy Creek is a stream in the municipalities of Trent Hills and Alnwick/Haldimand, Northumberland County, in Central Ontario, Canada.

Percy Creek begins at an unnamed marsh, about 2 kilometres (1.2 mi) south of the community of Roseneath, in geographic Alnwick Township in the municipality of Alnwick/Haldimand.

It flows northeast through several portions of the lands of the Alderville First Nation, passes into geographic Percy Township in the municipality of Trent Hills, and reaches its northernmost point north of the community of Brickley.

Percy Creek passes under County Road 25, over a small dam, takes in the right tributary Burnley Creek, turns north, heads into geographic Seymour Township, passes under County Road 30, and reaches its mouth at the Trent River at the community of Meyersburg.

[2] The Trent River flows to the Bay of Quinte on Lake Ontario.