| 3676 | 02 Aug 26 | Seize the Day: Amer's Epilepsy Trail Run | 1M/5K/10K | Mendon, NY |
| 3677 | 26 Sep 26 | Seiz Up: A Run for Epilepsy Awareness | 5K/13.1M/26.2M | Gulf Breeze, FL |
| 3678 | 19 Sep 26 | SEF Arts Fest 5K & Bubble-K Fun Run | 5K | Sherman, TX |
| 3679 | 01 Aug 26 | Seeley Lake Challenge Duathlon/Triathlon | Sprint Duathlon/Sprint Triathlon/youth triathlon | Seeley Lake, MT |
| 3680 | 29 Aug 26 | Seedorf McMeekin 5K | 5K | Atlantic, NJ |
| 3681 | 14 Jun 26 | SEED School of MD s Run-Up-To Juneteenth 5K | 5K | Baltimore, MD |
| 3682 | 27 Jun 26 | Secret City Sprint Triathlon | Sprint Triathlon/Sprint Triathlon Relay | Oak Ridge, TN |
| 3683 | 14 Nov 26 | Secret City Half Marathon | 5K/13.1M | Oak Ridge, TN |
| 3684 | 05 Dec 26 | Second Summit Reindeer Run | 5K/10K | Millcreek, UT |
| 3685 | 25 Sep 26 | Second Stride 5K | 2.5K/5K | Paris, KY |
| 3686 | 08 Aug 26 | Second Chance 5K Run | 5K | Saint Michael, PA |
| 3687 | 12 Sep 26 | Second Beach Sprint Triathlon | Sprint Triathlon/Sprint Triathlon Relay | Middletown, RI |
| 3688 | 21 Jun 26 | Sebastopol Solstice 5K Summer | 5K | Sebastopol, CA |
| 3689 | 18 Sep 26 | SeaWorld Orlando Howl-O-Sprint 5K | 5K | Orlando, FL |
| 3690 | 24 Oct 26 | Seawitch Fall Half Marathon | 13.1M | Lewes, DE |