The following teams have expressed interest in participating in 2021 RBW7s:
- ARPTC (USA)
- Atlantis (USA)
- Beltway Elite 7s (USA)
- Border Rievers (Scotland)
- Canagerms (Canada/Germany)
- Coastal Carolina 7s (USA)
- Clemson Rugby (USA)
- Dead Pelicans (USA)
- Deutschland 7s (Germany)
- Find Rugby Now (Canada)
- Gorilla Rugby Academy (USA)
- LAR (UK & France)
- Law Society (England)
- LeadHership Angels (Canada)
- Leman flames 7s (Switzerland)
- NAV 7s (USA)
- Northeast Academy )USA)
- NSCRO (USA)
- NY Area 7s (USA)
- Oasis 7s (USA)
- Ponty Butchers 7s (Wales)
- Quebec Women (Canada)
- Raggamuffins (USA)
- Renegade Rugby (USA)
- Roots Rugby (USA)
- Rugby Ecosse Feminin (Scotland)
- Samurai 7s (England)
- Scion Sirens (USA)
- South Wales Wildcats (Wales)
- Swansea Cygnets (Wales)
- Swifts 7s (England)
- Tailenders Rugby Academy (England)
- The Old Guard (England)
- Toronto Sinners (Canada)
- Wailers (England)
- Wooden Spoon Marauders (England)