2023 Rugby World Cup warm-up matches

In July and August 2023, several rugby union national teams played matches in preparation for the 2023 Rugby World Cup. Some of the matches involving Tier 1 and 2 nations were played under the Summer Nations Series branding.

June
Notes:
 * Pita Ahki and Kyren Taumoefolau (both Tonga) made their international debuts.
 * This was the first international match Tonga played at home since 2017.

Notes:
 * Cameron Henderson, Stafford McDowall (both Scotland), Martin Page-Relo and Lorenzo Pani (both Italy) made their international debuts.

Notes:
 * Cristobal Game (Chile) made his international debut.

5 August
Notes:
 * Dallas McLeod, Samipeni Finau, Shaun Stevenson (all New Zealand) and Matt Faessler (Australia) made their international debuts.

Notes:
 * Louis Bielle-Biarrey, Paul Boudehent and Émilien Gailleton (all France) made their international debuts.

Notes:
 * Kieron Assiratti, Corey Domachowski, Max Llewellyn, Taine Plumtree, Henry Thomas (all Wales), Theo Dan, Tom Pearson and Tom Willis (all England) made their international debuts.
 * Leigh Halfpenny became the ninth Welshman to earn 100 test caps.

Notes:
 * Andrei Mahu, Sikuea Taliuli, Manumua Tevita (all Romania), Tommaso Boni, Sam Golla, Chris Mattina, Nick McCarthy, Paddy Ryan, Thomas Tu’avao, Jake Turnbull, Luke White and Takaji Young Yen (all United States) made their international debuts.

Notes:
 * Ciarán Frawley, Calvin Nash, Tom Stewart (all Ireland), Paolo Buonfiglio, Dino Lamb and Paolo Odogwu (all Italy) made their international debuts.

Notes:
 * Martín Bogado (Argentina) and Gerhard Steenekamp (South Africa) made their international debuts.
 * Agustín Creevy became the first Argentinean to earn 100 test caps.
 * Santiago Cordero (Argentina) earned his 50th test cap.

Notes:
 * Ignacio Álvarez, Diego Ardao, Ignacio Facciolo, Juan Manuel Tafernaberry (all Uruguay), Haitembu Shikufa, Tiaan Swanepoel and Gihard Visagie (all Namibia) made their international debuts.

10 August
Notes:
 * Izzak Kelly, Siôn Parry, Travis Larsen and Mitch Richardson (all Canada) made their international debuts.

12 August
Notes:
 * This was Georgia's biggest win over Romania, surpassing the 29-point difference set when they won 38–9 in 2016.
 * This was Romania's largest defeat to any Tier 2 nation, previously 37–0 to the United States set in 1924.

Notes:
 * Kemsley Mathias, Joe Roberts and Keiran Williams (all Wales) made their international debuts.
 * Ellis Genge (England) and Josh Adams (Wales) earned their 50th test caps.

Notes:
 * Joris Moura (Portugal), Lauina Futi and Kaleb Geiger (both United States) made their international debuts.

Notes:
 * Esteban Inostroza (Chile) and Tiaan de Klerk (Namibia) made their international debuts.
 * This was the first meeting between these nations.

15 August
Notes:
 * Tasi Feke, Christopher Halaʻufia, John Ika, Paula Latu, Vutulongo Puloka, Sione Tupou (all Tonga) and Gabe Casey (Canada) made their international debuts.

18/19 August
Notes:
 * Cai Evans and Teddy Williams (Wales) made their international debuts.
 * Dan Biggar, Alex Cuthbert and Liam Williams were all originally named to start for Wales, but each withdrew prior to the match due to injury. Their places in the starting line-up were taken by Sam Costelow, Cai Evans and Tom Rogers, the latter of whom was replaced on the bench by Louis Rees-Zammit.

Notes:
 * Keith Earls became the ninth Irishman to earn 100 test caps for his country.

25–27 August
Notes:
 * This was New Zealand's heaviest-ever defeat (28 points), surpassing Australia's 21-point victories over New Zealand (1999, 2019).

Notes:
 * This was England's first-ever defeat against a tier-two nation.
 * This was Fiji's first-ever win against England.
 * Courtney Lawes became the fifth Englishman to earn 100 test caps.

Notes:
 * Amanaki Saumaki (Japan) made his international debut.

Notes:
 * Lima Sopoaga (Samoa) made his international debut.

Notes:
 * Issak Fines-Leleiwasa and Blake Schoupp (both Australia) made their international debuts.