Phelps Motor Vehicle Company was a manufacturer of automobiles in Stoneham, Massachusetts, between 1903 and 1905.

[3][4] In the late 1890's he became interested in steam powered vehicles and in 1901 marketed the Phelps Tractor.

L. J. Phelps designed the vertically mounted water-cooled straight-3 engine, situated at the front of the car, producing 15 hp (11 kW; 15 PS).

[9][10] The Phelps motor car won a double victory in the1903 Eagle Rock, N.J. Hill Climb.

[8] L. J. Phelps designed a 4-cylinder engine but in September 1905 decided to retire to his Forty Oaks Ranch in Paradise, California.