Ōmiya Velodrome (大宮競輪場, Ōmiya Keirinjyō) is a velodrome located in Ōmiya-ku, Saitama that conducts pari-mutuelKeirin 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 25# (25 sharp).
Ōmiya's oval is 500 meters in circumference. A typical keirin race of 2,025 meters consists of four laps around the course.