Warwick is a rural township in Lambton County, Ontario, Canada, with a population (2016) of 3,692. Bisected by the Egremont Road that was surveyed to link London with the Lake Huron shoreline in 1832, the township began to attract settlers including those helped by charitable organizations, such as Lord Sheffield's Petworth settlers, and retired soldiers from the British Army. A village by the same name was surveyed within the township where Bear Creek crossed the Egremont. In addition to Warwick and Watford, the township also includes the smaller communities of Birnam and Wisbeach.