| 886 | 02 Aug 25 | 2025 Thousand Oaks Kids Triathlon | triathlon | Parkville, MO |
| 887 | 30 Aug 25 | 2025 Thunderbolt Youth Triathlon | triathlon | Sierra Vista, AZ |
| 888 | 13 Dec 25 | 2025 Tinsel Trot 5k/10k | 10K/5K | Louisa, VA |
| 889 | 02 Aug 25 | 2025 Titanium Man Junior Triathlon | triathlon | Richland, WA |
| 890 | 23 Aug 25 | 2025 TOBAY Junior Triathlon - SATURDAY | triathlon | Oyster Bay, NY |
| 891 | 20 Sep 25 | 2025 Tobin Bolter / Ada County Kids Duathlon | triathlon | Garden, ID |
| 892 | 02 Aug 25 | 2025 Top Gun Triathlon | triathlon | St Petersburg, FL |
| 893 | 09 Aug 25 | 2025 TOSA Youth Tri | triathlon | Wauwatosa, WI |
| 894 | 13 Sep 25 | 2025 Toughman Triathlon - Olympic Events . . | triathlon | Stoney Point, NY |
| 895 | 20 Sep 25 | 2025 TOUGHMAN Westchester Triathlon - (SATURDAY) | triathlon | Rye, NY |
| 896 | 21 Sep 25 | 2025 TOUGHMAN Westchester Triathlon - (SUNDAY) | triathlon | Rye, NY |
| 897 | 27 Jul 25 | 2025 Tour de Kirkwood Triathlon | triathlon | Kirkwood, MO |
| 898 | 14 Sep 25 | 2025 Tradewind Triathlon | triathlon | Kaneohe Bay, HI |
| 899 | 23 Nov 25 | 2025 Trail Blazer 10K - 5K | 5K/10K | Peoria, AZ |
| 900 | 28 Sep 25 | 2025 Treasure Island Triathlon, Duathlon, Aquabike, & Kayak Triathlon | triathlon | Point Pleasant, NJ |