| 361 | 04 Jul 25 | 2025 Davis Lake Triathlon | triathlon | Luverne, MN |
| 362 | 19 Oct 25 | 2025 DC Fall Classic 5k/Half | 13.1/5K | Washington, DC |
| 363 | 11 May 25 | 2025 DC Mother’s Day 5k & 10k | 10K/5K | Washington, DC |
| 364 | 08 Jun 25 | 2025 Deer Creek Triathlon & Duathlon ?? . . | triathlon | New Holland, OH |
| 365 | 07 Sep 25 | 2025 DeGray Lake Trifest | triathlon | Arkadelphia, AR |
| 366 | 28 Jun 25 | 2025 Delaware State Championship Newark SwimFest & SwimRun | triathlon | Newark, DE |
| 367 | 12 Jul 25 | 2025 Delta Lake Triathlon | triathlon | Rome, NY |
| 368 | 05 Jul 25 | 2025 Deltaville 5k & Fun Run | 1M/5K | Deltaville, VA |
| 369 | 31 May 25 | 2025 Deuces Wild Endurance Festival (Saturday Events) | triathlon | Show Low, AZ |
| 370 | 14 Sep 25 | 2025 Devil's Challenge Triathlon | triathlon | Baraboo, WI |
| 371 | 19 Jul 25 | 2025 DeWitt Crossroads Triathlon | triathlon | DeWitt, IA |
| 372 | 12 Jul 25 | 2025 Diamond in the Rough Triathlon | triathlon | Perryville, MD |
| 373 | 27 Apr 25 | 2025 Diamond Mountain Duathlon . . | triathlon | Stony Point, NY |
| 374 | 06 Sep 25 | 2025 Diamond Tri Your Best Triathlon . . | triathlon | Newport, WA |
| 375 | 17 May 25 | 2025 Dickson Endurance & Iron Nugget Sprint Triathlon . . | triathlon | Burns, TN |