The Fort Smith Railroad Company (AAR reporting marks FSR) is a Class III short-line railroad headquartered in Fort Smith, Arkansas.

FSR operates an 18 mile (29 km) line in Arkansas from Fort Smith (where it interchanges with Kansas City Southern Railway, Union Pacific Railroad, and Arkansas and Missouri Railroad) to Fort Chaffee.

FSR traffic generally consists of grain, food products, paper products, scrap and finished steel, lumber, peanuts, alcohol, military equipment, and charcoal.

The original line consisting of 47 miles (76 km) to Paris, Arkansas was built in the 1890s by a Union Pacific predecessor, and was leased to FSR in 1991. The portion between Fort Chaffee and Paris was abandoned in 1995. FSR is a subsidiary of Pioneer Railcorp.