| 526 | 20 Sep 25 | 2025 Lost Dog 5k/10k | 10K/5K | Lorton, VA |
| 527 | 03 Aug 25 | 2025 Lums Pond Triathlon | triathlon | Bear, DE |
| 528 | 16 Aug 25 | 2025 Luray Triathlon & Duathlon - SATURDAY EVENTS | triathlon | Luray, VA |
| 529 | 03 Aug 25 | 2025 Maine Lobster Festival 10K/5K Road Race | 5K/10K | Rockland, ME |
| 530 | 03 Aug 25 | 2025 Maine Lobster Festival Kids' Fun Run | 1 Mile | Rockland, ME |
| 531 | 22 Aug 25 | 2025 Maple Grove Tri - FRIDAY Kids Splash n Dash | triathlon | Maple Grove, MN |
| 532 | 27 Jul 25 | 2025 Marble Falls Triathlon . . | triathlon | Marble Falls, TX |
| 533 | 19 Jul 25 | 2025 Martinsburg Sprint Triathlon | triathlon | Martinsburg, WV |
| 534 | 08 Aug 25 | 2025 Mason District 5k/10k | 10K/5K | Annandale, VA |
| 535 | 26 Jul 25 | 2025 Matt Mason Cowboy Up Triathlon & Duathlon | triathlon | Smithville, MO |
| 536 | 11 Oct 25 | 2025 Memorial Hermann 10 for Texas, 3.1 Armadillo Run (5K) & One 4 Texas Kids' Fun Run | 5K | The Woodlands, TX |
| 537 | 04 Oct 25 | 2025 Mermaid Triathlon & Duathlon Capitola | triathlon | Capitola, CA |
| 538 | 03 Aug 25 | 2025 Merrie Mill Farm 5k/10k | 10K/5K | Keswick, VA |
| 539 | 31 Aug 25 | 2025 MI Triathlon / Duathlon Championship | triathlon | Detroit, MI |
| 540 | 25 Oct 25 | 2025 Miami Beach Halloween Half Marathon & Freaky 4-Miler | Half Marathon | Miami Beach, FL |