Essa is a township in Ontario, Canada, west and south of the city of Barrie in Simcoe County. It is bounded by County Road 90 to its north, County Road 27 to its east, and Ontario Highway 89 to its south. The township is about 100 kilometres (62 mi) from Toronto.
The main communities of this township are Angus, Thornton, and Baxter. Other small hamlets are Cedargrove, Colwell, Egbert, Elmgrove, Hoe Doe Valley, Ivy, Utopia and West Essa.
Angus is the largest community in Essa Township, and the main access to the neighbouring Canadian Forces Base Borden. It offers services such as a library, catholic and public elementary schools, public secondary school, a small shopping centre, many stores, a chamber of commerce and a recreation facility. Angus is located in the northwestern part of Essa township. Located in Essa's municipal Ward 1, the township councillor for Angus is Keith White.