| 2566 | 04 Oct 25 | South Texas Ultra | 5K/17K/35K/50K | Leakey, TX |
| 2567 | 07 Dec 25 | South Texas International Marathon | 26.2M | Mercedes, TX |
| 2568 | 19 Oct 25 | South Street Youth Center Family 5K | 5K | Jamaica Plain, MA |
| 2569 | 02 Nov 25 | South Shore Half Marathon and 5K | 5K/Half Marathon | Hingham, MA |
| 2570 | 02 Nov 25 | South Shore Half Marathon and 5K | 13.1/5K | Hanover, MA |
| 2571 | 27 Sep 25 | South Shore 3 Beach Minimum Half Marathon | 13.1M | Hull, MA |
| 2572 | 27 Sep 25 | South Shore "3 Beach Minimum" Half Marathon 2025 | Half Marathon | Hull, MA |
| 2573 | 28 Sep 25 | South Seas Captiva Island Triathlon | Sprint/Sprint Duathlon/Sprint Triathlon Relay/supersprint triathlon | Captiva, FL |
| 2574 | 06 Dec 25 | South Riding Jingle Bell Dash | 1M/5K/10K | South Riding, VA |
| 2575 | 06 Dec 25 | South Pasadena Tiger Run | 5K/10K | South Pasadena, CA |
| 2576 | 19 Oct 25 | South Park 5K | 5K | South Park, PA |
| 2577 | 28 Sep 25 | South Padre Island Triathlon | Olympic/Sprint Triathlon/Sprint Triathlon Relay | South Padre Island, TX |
| 2578 | 08 Nov 25 | South Padre Island Half Marathon Weekend | 1M/5K | South Padre Island, TX |
| 2579 | 01 Nov 25 | South of the Mountain Trail Run | 5K | Bostic, NC |
| 2580 | 21 Mar 26 | South Mountain 5K, 10K | 1M/5K/10K | Valdese, NC |