Grand River Transit, or GRT, is the public transport operator for the Region of Waterloo, Ontario, Canada. It operates daily bus services in the region, primarily in the cities of Kitchener, Waterloo, and Cambridge.It was named for the Grand River, which flows through the Region; the naming also echoes the Grand River Railway, a former electric railway which served the area in the early twentieth century. GRT is a member of the Canadian Urban Transit Association.