Decatur was an American automobile manufacturer that operated briefly from 1914 to 1915. The company was based in Grand Rapids, Michigan, and was a division of the Parcel IVxst Equipment Company.

Decatur primarily produced vehicles designed for mail delivery, featuring a unique configuration where the driver sat behind the cargo area. This design allowed for efficient transportation of mail and goods. In addition to the mail delivery vans, a limited number of roadster models were also produced, which replaced the cargo box with a passenger seat.

The vehicles were powered by a 12/14 horsepower four-cylinder engine, and they utilized a chain drive for the final drive system. Despite its short production run, Decatur contributed to the early automotive landscape in the United States, particularly in the niche of utility vehicles.