Thames Centre is a municipality in Middlesex County, Ontario, Canada, directly east of the City of London. It was formed on January 1, 2001, when the townships of West Nissouri and North Dorchester were amalgamated. It is part of the London census metropolitan area.

Communities in the township include: Avon, Belton, Cherry Grove, Crampton, Cobble Hill, Derwent, Devizes, Dorchester, Evelyn, Fanshawe Lake, Friendly Corners, Gladstone, Harrietsville, Kelly Station, Mossley, Nilestown, Oliver, Putnam, Salmonville, Silvermoon, Thorndale (mayor – John Fluttert), Three Bridges, and Wellburn.

Dorchester is the residential and commercial core of the township. Every year, there are many events held in Dorchester such as the Dorchester Fair, the Dorchester Car Show, the Run to the Fair 5k Road Race, and the Dorchester Dolphins. The Donnybrook Fiddle and Step Dance Competition has become an annual event held at the fairgrounds every Civic Long Weekend. This event brings fiddlers and steppers from all over the province and the North Eastern United States.