U.S. Men's Roster
- Perry Baker, Wing
- Dany Barrett, Prop/Hooker
- Maceo Brown, Utility
- Madison Hughes (Captain), Halfback
- Martin Iosefo, Center/Prop
- Carlin Isles, Wing
- Matai Leuta, Forward
- Folau Niua, Halfback/Flyhalf
- Brett Thompson*, Forward
- Joe Schroeder, Forward
- Stephen Tomasin, Utility
- Kevon Wiliams, Halfback/Wing
- Cody Melphy* (Alternate), Forward
- Naima Fualaau (Traveling Reserve), Halfback/Flyhalf
- Malacchi Esdale (Traveling Reserve), Center/Wing
*Thompson was announced as the replacement for injured forward Ben Pinkelman on July 7. Melphy replaced Thompson as the team's alternate.
U.S. Women's Roster
- Kayla Canett-Oca, Halfback/Flyhalf
- Lauren Doyle, Flyhalf/Wing
- Cheta Emba, Prop
- Abby Gustaitis (Co-Captain), Prop/Hooker
- Nicole Heavirland, Hooker/Scrumhalf
- Leyla Alev Kelter, Center/Prop
- Kristi Kirshe, Center/Wing
- Ilona Maher, Center/Prop
- Jordan Matyas, Prop
- Ariana Ramsey, Wing
- Naya Tapper, Wing
- Kristen Thomas (Co-Captain), Hooker/Center
- Nia Toliver (Alternate), Prop/Wing
- Kasey McCravey (Traveling Reserve), Hooker/Flyhalf
- Nana Fa'avesi (Traveling Reserve), Prop/Wing
Other Qualified Nations
| Men's Tournament | Women's Tournament |
|---|---|
| Japan | Japan |
| Fiji | New Zealand |
| New Zealand | Canada |
| South Africa | Australia |
| Argentina | Brazil |
| Canada | Great Britain |
| Great Britain | Kenya |
| Australia | Fiji |
| Kenya | China |
| South Korea | France |
| Ireland | Russian Olympic Committee |