thumb|280x280px|The Otto Car - 1911 postcard
thumb|1911 Otto advertisement in Cycle and Automobile Trade Journal
Otto and Ottomobile were brass era automobile marques of the Otto Gas Engine Works of Philadelphia, Pennsylvania from 1910 to 1912.
History
The Otto Gas Engine Works was established by Gas-motoren-Fabrik Deutz as a subsidiary to market the Otto engine in the United States. Based in Philadelphia, Otto Gas Engine experimented with gasoline vehicles resulting in the Otto Tractor in 1896. The primary business was stationary gas engines until 1910 when Otto Gas Engine introduced an automobile equipped with an Otto engine.