In 2021 zullen we met een record aantal ploegen starten aan de Team Triathlon Series:
| 1ste divisie heren | 1ste divisie dames | 2de divisie heren |
| 1. TRIGT – ARENA | 11. ATRIAC – 6D Sports Nutrition | 30. 3PT – Solidpharma |
| 2. SMO – SCOTT | 12. SPTC Athletes for hope – LOTTO | 31. KTT Zamaro – Willier Heren |
| 3. ATRIAC – 6D Sports Nutrition | 13. KTT – Ufficio 2.0 Women | 32. SMO – SCOTT |
| 4. TDL – Forsite | 14. EFC – JODA – ITC | 33. NSTT |
| 5. KTT – Ufficio 2.0 Men | 15. SP&O – SIMAC Team | 34. SP&O – SIMAC Team |
| 6. SP&O – SIMAC Team | 16. TRIGT – Wantyoubike | 35. TDL – Delaware |
| 7. 3PT – Solidpharma | 17. 3MD Veldeman – WCUP | 36. TRIGT |
| 8. 3MD Veldeman – WCUP | 18. Lommelse Triatleten – Hoeks Self Storage | 37. WTT – Imacar |
| 9. Triatlon Brugge Team | 19. WTT – Imacar | 38. Triatlon Team Limburg |
| 10. EFC – JODA – ITC | 20. 3PT – Solidpharma | 39. EFC – JODA – ITC |
| 21. Betopor No Limit Team | 40. 3MD Veldeman – WCUP | |
| 41. ATRIAC – 6D Sports Nutrition | ||
| 42. RCBT – Trakks | ||
| 43. BTC | ||
| 44. Lommelse Triatleten – Hoeks Self Storage | ||
| 45. KTT Zamaro – Willier Youth | ||
| 46. Team Lencom – Trisport MnK | ||
| 47. Team Steengoed – Trisport MnK (2) | ||
| 48. Betopor No Limit Team | ||
| 49. Triathlon Team Braine |