Keiyu Mamiya

United StatesUnited StatesActive
Events
1500 m

Keiyu Mamiya is a United States middle-distance runner. He competes primarily in the 1500m, Mile and Mile.

His personal bests include 3:47.50 in the 1500m, 4:14.39 in the Mile, 4:09.44 in the Mile, 8:31.79 in the 3000m and 8:36.08 in the 3000m-short-track. He is currently active on the international athletics circuit, representing United States.

Personal best · 1500 m3:47.50
2026 season best3:47.50May 14, 2026 · MIT Sherie and Don Morrison Track, Cambridge, MA
2026 season best
Last competitionNCAA Division III Outdoor Track and Field ChampionshipsMay 23, 2026 · 3:52.45
NCAA Division III Outdoor Track and Field Championships

As of Nov 15, 2026: 1500 m 3:47.50, 2026 season best 3:47.50 (May 14, 2026, MIT Sherie and Don Morrison Track, Cambridge, MA (USA)) · Last competition: NCAA Division III Outdoor Track and Field Championships, May 23, 2026, 3:52.45

Personal bests

WA points calculator →
DisciplineResultAll-time2026
1500mMA 2026United States 1500 m all-time list3:47.501,009 pts––
MileWA 2024United States Mile all-time list4:14.39905 pts––
MileIndoorMA 20264:09.441,011 pts–#837
3000mOR 2025United States 3000 m all-time list8:31.79878 pts––
3000m-short-trackIndoorMA 20258:36.08873 pts––
mile-short-trackMA 20264:11.61985 pts–#574

Progression

SeasonDisciplineResultWindDateCompetitions
20261500m 3:47.50–May 14, 2026MIT Final Qualifier
2026Mile Indoor4:09.44–Feb 13, 2026Boston University David Hemery Valentine Invitational, Boston Univ. Track & Tennis Center, Boston, MA (i)
2026mile-short-track Indoor4:09.44–Feb 13, 2026Boston University David Hemery Valentine Invitational, Boston Univ. Track & Tennis Center, Boston, MA (i)
2026mile-short-track 4:11.61–Jan 31, 2026Boston University John Thomas Terrier Classic
2026DistanceMe Indoor9:47.56–Mar 13, 2026NCAA Division III Indoor Track and Field Championships
20253000m 8:31.79–Jun 15, 2025Portland Track Festival, Griswold Stadium, Portland, OR
20253000m-short-track Indoor8:36.08–Dec 6, 2025Early Bird Invite, The Track at New Balance, Boston, MA (i)
2024Mile 4:14.39–Jun 12, 2024Brooks PR Invitational, Renton Memorial Stadium, Renton, WA - High School Events
FAQ

Frequently asked questions

Keiyu Mamiya's 1500 m personal best is 3:47.50, set on May 14, 2026 in MIT Sherie and Don Morrison Track, Cambridge, MA (USA).

Keiyu Mamiya competes in the 1500 m.

2026 season best: 3:47.50, set on May 14, 2026 in MIT Sherie and Don Morrison Track, Cambridge, MA (USA). Last competition: NCAA Division III Outdoor Track and Field Championships on May 23, 2026, 3:52.45.