The Marsh Motorcycle Company is a veteran era American motorcycle maker founded in Brockton, Massachusetts.
The company was formed by the Marsh brothers in Brockton in 1899. In 1905, it was combined with Charles Metz's Metz Motorcycle Company to create the American Motorcycle Company.
The Marsh brothers also created the Marsh Motor Carriage Company in 1899. Steam and gasoline runabouts were built on a limited basis.