Gray-Dort Motors was a Canadian automobile manufacturer in Chatham, Ontario, Canada, from 1915 to 1925. It started as Canadian carriage works of William Gray & Sons Company Ltd, founded in 1855 by William Gray. In the mid 1900s Robert Gray (William's father, then president of the company) began to build Ford bodies for the Walkerville factory. They continued to do so until 1912. During this period, they also built bodies for the locally built Chatham car. Over the course of its lifetime, Gray-Dort manufactured around 26,000 automobiles.