Rice Lake is a lake located in Northumberland and Peterborough counties in south-eastern Ontario. The lake is located south of the city of Peterborough, and the Kawartha Lakes and north of Cobourg. It is part of the Trent-Severn Waterway, which flows into the lake by the Otonabee and out via the Trent. The lake is 28 kilometres (17 mi) long and 5 km wide. Its maximum depth is 10m, with a surface water level at 187 m above sea level, raised to its present height by the Hastings Dam, built in the 19th century as part of the Trent-Severn canal system. Natives called it Pemadashdakota or "lake of the burning plains".

Northumberland County is an upper-tier municipality situated on the north shore of Lake Ontario, east of Toronto in Central Ontario. The Northumberland County headquarters are located in Cobourg.