The Keiō Keibajō line (京王競馬場線, Keiō Keibajō-sen) is a railway line in Fuchū, Tokyo, Japan, owned and operated by the private railway operator Keio Corporation.

It connects Higashi-Fuchū on the Keiō Line and Fuchū-Keiba-Seimon-mae, and services the Tokyo Racecourse as well as the surrounding suburbs.

During weekdays served by two-car local trains goes back and forth between Higashi-Fuchū and Fuchūkeiba-seimommae, while on weekends and holidays (as well as during events at the nearby Tokyo Racecourse) 8-car and 10-car local and express trains are operated through from the Keiō Line.

The line opened on 29 April 1955 as dual track electrified at 600 VDC.

[1] The voltage was increased to 1500 VDC in 1963.