James Tedesco finished 2026 with the World Cup, NRL premiership and State of Origin titles, and the Clive Churchill Medal after the grand final.
His final appearance for Australia was Sunday's World Cup final victory over New Zealand, ending a three-year absence from the national side.
He played against Fiji in the group stage and the final minutes of the final, reaching 15 Test appearances.
Reece Walsh had been Australia's first-choice fullback throughout the tournament.
Speaking to Channel 7 after fulltime, Tedesco confirmed his international retirement.
"It's really special, this is my last time wearing this Australian jersey so to finish by winning a World Cup, it's special."
The Sydney Roosters and NSW Blues fullback is still likely to represent NSW next year and has said he wants to play until at least the end of 2028.
Off contract with the Roosters after 2027, he is considering his playing future one season at a time.