Mairin O'brien

United StatesUnited StatesActive
Events
Mile Short Track

Mairin O'brien is a United States middle-distance runner. She competes primarily in the 1500m, Mile and 3000m.

Her personal bests include 4:38.10 in the 1500m, 4:54.87 in the Mile, 10:01.30 in the 3000m, 10:31.00 in the 3000mSt and 5:00.02 in the mile-short-track. She is currently active on the international athletics circuit, representing United States.

Personal best · Mile Short Track5:00.02
2026 season best5:00.02Jan 17, 2026 · Gladstein Fieldhouse Indiana Un., Bloomington, IN
2026 season best
Last competitionMid-American Conference Outdoor Track & Field ChampionshipsMay 14, 2026 · 10:41.04
Mid-American Conference Outdoor Track & Field Championships

As of Nov 15, 2026: Mile Short Track 5:00.02, 2026 season best 5:00.02 (Jan 17, 2026, Gladstein Fieldhouse Indiana Un., Bloomington, IN (USA)) · Last competition: Mid-American Conference Outdoor Track & Field Championships, May 14, 2026, 10:41.04

Personal bests

WA points calculator →
DisciplineResultAll-time2026
1500mNC 2026United States 1500 m all-time list4:38.10919 pts––
MileIndoorMI 20264:54.87975 pts–#854
3000mIndoorMI 202510:01.30928 pts––
3000mStOH 2026United States 3000 m steeplechase all-time list10:31.001,022 pts––
mile-short-trackIN 20265:00.02940 pts–#616
mile-short-trackIndoorMI 20264:54.87975 pts–#866

Progression

SeasonDisciplineResultWindDateCompetitions
20261500m 4:38.10–Apr 17, 2026Wake Forest Invitational, Kentner Stadium Wake Forest University, Winston Salem, NC - Section A
2026mile-short-track Indoor4:54.87–Feb 27, 2026Mid-American Conference Indoor Track & Field Championships
2026Mile Indoor4:54.87–Feb 27, 2026Mid-American Conference Indoor Track & Field Championships
2026mile-short-track 5:00.02–Jan 17, 2026Indiana Invitational
20263000mSt 10:31.00–May 2, 2026Jesse Owens Track & Field Classic, Jesse Owens Stadium, Columbus, OH
2026DistanceMe Indoor11:57.20–Jan 16, 2026Indiana Invitational
2026DistanceMe 11:57.20–Jan 16, 2026Indiana Invitational
20253000m Indoor10:01.30–Dec 5, 2025Grand Valley State Holiday Open, GVSU Kelly Family Sports Cente, Allendale, MI (i)
FAQ

Frequently asked questions

Mairin O'brien's Mile Short Track personal best is 5:00.02, set on Jan 16, 2026 in Gladstein Fieldhouse Indiana Un., Bloomington, IN (USA).

Mairin O'brien competes in the Mile Short Track.

2026 season best: 5:00.02, set on Jan 17, 2026 in Gladstein Fieldhouse Indiana Un., Bloomington, IN (USA). Last competition: Mid-American Conference Outdoor Track & Field Championships on May 14, 2026, 10:41.04.