The 2023 Rugby Championship was the eleventh edition of the annual southern hemisphere competition, involving Argentina, Australia, New Zealand and South Africa.
The competition was operated by SANZAAR, a joint venture of the four countries' national unions, and known for sponsorship reasons as The Castle Rugby Championship in South Africa, The Lipovitan-D Rugby Championship in New Zealand, The eToro Rugby Championship in Australia, and The Zurich Rugby Championship in Argentina.
As in previous Rugby World Cup years, the tournament was reduced, with each nation only playing each other once as part of the Championship.
New Zealand retained the title, the 20th time they won the title.
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On 23 June, Michael Cheika named a 48-man squad ahead of the 2023 Rugby Championship and in preparation for the 2023 Rugby World Cup.
On 25 June, Eddie Jones named a 34-man squad for the opening two matches of the 2023 Rugby Championship.
Angus Bell, Langi Gleeson, Andrew Kellaway, Samu Kerevi, Jordan Petaia and Matt Philip were also included as an rehab group that will train with the squad.
On 10 July, Pone Fa'amausili and Blake Schoupp joined up with the squad ahead of the Argentina test whilst Taniela Tupou was temporarily released to Australia A.
On 20 July, Eddie Jones named an up-dated 34-player squad for the Bledisloe Cup series which saw Matt Gibbon, Reece Hodge, Josh Kemeny, Zane Nonggorr, Pete Samu and Tom Wright dropped from the squad. Len Ikitau was also not included following injury sustained against Argentina.
On 18 June, head coach Ian Foster confirmed a 36-player squad for the 2023 Rugby Championship.
On 10 June, head coach Jacques Nienaber named a 41-man squad ahead of the 2023 Rugby Championship.