The Upper Thames River Conservation Authority is a body based in London, Ontario, Canada.

It was responsible for the construction of the Fanshawe Dam, completed in the 1950s, to control flooding from the Thames River, which runs through London.

When the region warmed at the end of the ice age, the glacier melted and receded North, leaving behind a drainage ditch and features such as Sifton Bog.

In 1937, such flooding had devastating consequences, destroying over 1,000 homes, and causing millions of dollars in damage.

Today, the Upper Thames River Conservation Authority is mainly a not-for-profit agency which monitors flora and fauna welfare in the area and gives tours to local kids on school field trips.