In 2021 zullen we met een record aantal ploegen starten aan de Team Triathlon Series:
| 1ste divisie heren | 1ste divisie dames | 2de divisie heren |
| 3MD Wcup-Team-Veldeman | 3MD Wcup-Team-Veldeman | 3MD Wcup-Team-Veldeman |
| 3PT – Solidpharma | 3PT – Solidpharma | 3PT – Solidpharma |
| ATRIAC – 6d Sports Nutrition | ATRIAC – 6d Sports Nutrition | ATRIAC – 6d Sports Nutrition |
| EFC-JODA-ITC | EFC-JODA-ITC | BTC |
| KTT Ufficio 2.0 Men | KTT Ufficio 2.0 Women | Triatlon Team Limburg |
| SMO-SCOTT | LT | EFC-JODA-ITC |
| SP&O – SIMAC team | NLT | KTT Ufficio 2.0 Talents (1) |
| Triatlon Brugge Team | SP&O – SIMAC team | KTT Ufficio 2.0 Talents (2) |
| TDL-Forsite | SPTC – Athletes for hope | LT |
| TRIGT | TRIGT | NLT |
| WTT IMACAR | NSTT | |
| RCBT – Trakks | ||
| SMO-SCOTT | ||
| SP&O – SIMAC team | ||
| TDL-Delaware | ||
| TRIGT | ||
| Trisport MnK (1) | ||
| Trisport MnK (2) | ||
| Triathlon Team Braine | ||
| WTT IMACAR |