| 496 | 04 Dec 25 | 2025 Rat Race City to Sea . . | triathlon | Key Biscayne, FL |
| 497 | 14 Dec 25 | 2025 Reindeer Romp 5k/10k | 10K/5K | Washington, DC |
| 498 | 06 Dec 25 | 2025 Reindeer Run 5K/Egg Nog 1 Mile (1 Mile - Noon, 5K - 12:30 pm) | 5K | Villa Rica, GA |
| 499 | 07 Sep 25 | 2025 Reston Olympic Triathlon | triathlon | Reston, VA |
| 500 | 27 Sep 25 | 2025 Rev3 Mighty Matapeake Beach Triathlon | triathlon | Stevensville, MD |
| 501 | 17 Aug 25 | 2025 Rex Wellness Triathlon - NW Cary | triathlon | Cary, NC |
| 502 | 20 Sep 25 | 2025 Rexburg Rush Triathlon | triathlon | Rexburg, ID |
| 503 | 21 Sep 25 | 2025 Ride Row Run | triathlon | Maupin, OR |
| 504 | 16 Aug 25 | 2025 RipRoar Kids Triathlon - Johnston - Championships | triathlon | Johnston, IA |
| 505 | 18 Oct 25 | 2025 River Roux Triathlon | triathlon | New Roads, LA |
| 506 | 16 Aug 25 | 2025 Riverman/Riverwoman Triathlon | triathlon | Pierre, SD |
| 507 | 06 Sep 25 | 2025 Riversport Challenge TORC Triathlon | triathlon | Oklahoma, OK |
| 508 | 28 Sep 25 | 2025 Robious Landing Triathlon | triathlon | Midlothian, VA |
| 509 | 23 Aug 25 | 2025 Rochester Triathlon | triathlon | Rochester, NY |
| 510 | 06 Dec 25 | 2025 Rock Creek Reindeer Rumble 5k/10k | 10K/5K | Washington, DC |