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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 49.53 | March 29, 2024 | Liam Bell | University of California-Berkeley | NCAA Division I Mens Championships |
| 49.69 | March 23, 2018 | Ian Finnerty | Indiana University-Bloomington | NCAA Division I Mens Championships |
| 50.03 | Feb. 17, 2018 | Caeleb Dressel | University of Florida | Southeastern Conference Championships |
| 50.04 | March 28, 2014 | Kevin Cordes | University of Arizona | NCAA Division I Mens Championships |
| 50.70 | Dec. 6, 2013 | Kevin Cordes | University of Arizona | Texas Invitational |
| 50.74 | March 29, 2013 | Kevin Cordes | University of Arizona | NCAA Division I Mens Championships |
| 50.86 | March 27, 2009 | Damir Dugonjic | University of California-Berkeley | NCAA Division I Mens Championships |
| 51.56 | March 15, 2007 | Mike Alexandrov | Northwestern University | NCAA Division I Mens Championships |
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