The Auto-Bi was an early motorcycle made by the Thomas Motor Company in Buffalo, New York.

[4] The 1904 Auto-Bi had a 2.5-horsepower four-stroke 442 cc single-cylinder engine, a belt-driven transmission, and could reach speeds of 35 mph (59 km/h).

[6] The same year, one of the company directors, William C. Chadeayne, established a new record for a transcontinental crossing of the United States in 48 days.

[4][7] By 1912, the demand for motorcycles had dropped significantly, and the Thomas Motor company discontinued all production of two-wheeled machines.

The Auto-Bi was shown at the Guggenheim Museum's exhibit, The Art of the Motorcycle.