Seibu-en Velodrome (西武園競輪場, Seibuen Keirinjyō) is a velodrome located in Tokorozawa, Saitama that conducts pari-mutuel Keirin racing - one of Japan's four authorized "Public Sports" (公営競技, kōei kyōgi) where gambling is permitted. Its Keirin identification number for betting purposes is 26# (26 sharp).
Seibu-en's oval is 400 meters in circumference. A typical keirin race of 2,025 meters consists of five laps around the course.
The Seibu Railway Seibu-en Station provides direct access to the velodrome.