General Motors Diesel was a railway diesel locomotive manufacturer located in London, Ontario, Canada. It was created in 1949 as the Canadian subsidiary of the Electro Motive Division of General Motors (EMD) located in the United States.

In 1969 it was re-organized as the Diesel Division of General Motors of Canada, Ltd. The plant was re-purposed to include manufacture of other diesel-powered General Motors vehicles such as buses. Following the US-Canada Free Trade Agreement in 1989, all of EMD's locomotives were built at the London facility.

In 2005 new owners of EMD renamed the Canadian subsidiary Electro-Motive Canada. The plant was closed by EMD's new owner Progress Rail Services in 2012, with EMD's production remaining in LaGrange, Illinois and Muncie, Indiana.