| 646 | 17 Jul 25 | 2025 NSR Summer Camp . . | triathlon | Ardmore, OK |
| 647 | 09 Aug 25 | 2025 Nubble Light Challenge 2.4 Mile Ocean Swim | triathlon | York Beach, ME |
| 648 | 25 Oct 25 | 2025 Oakland Tri Club Youth Splash & Dash . . | triathlon | Oakland, CA |
| 649 | 26 Oct 25 | 2025 Ocean State Rhode Races - Marathon, Half Marathon and 5k | 5K | Narragansett, RI |
| 650 | 21 Sep 25 | 2025 Ohio Fall Challenge Triathlon . . | triathlon | New Holland, OH |
| 651 | 16 Nov 25 | 2025 Oilman Texas Triathlon | triathlon | Montgomery, TX |
| 652 | 27 Nov 25 | 2025 Oklahoma City Turkey Tracks 5K and 1-Mile Fun Run | 1M/5K/Running/1 Mile | Oklahoma City, OK |
| 653 | 13 Sep 25 | 2025 Oktoberfest 5k | 5K | Breckenridge, CO |
| 654 | 19 Sep 25 | 2025 Oktoberfest 5k/10k | 10K/5K | Alexandria, VA |
| 655 | 23 Aug 25 | 2025 Oldham County/OCPR Sprint Triathlon | triathlon | LaGrange, KY |
| 656 | 20 Jul 25 | 2025 Omaha Triathlon | triathlon | Omaha, NE |
| 657 | 14 Sep 25 | 2025 One Last Tri | triathlon | White Bear Lake, MN |
| 658 | 09 Aug 25 | 2025 Operation First Response 5k/10k | 10K/5K | Culpeper, VA |
| 659 | 16 Aug 25 | 2025 Oregon Kids Triathlon | triathlon | Oregon, WI |
| 660 | 24 Aug 25 | 2025 OTILLO SwimRun Mackinac Island | triathlon | Mackinac Island, MI |