Jack Bostock has earned a place in Australia's 23-player squad, giving the Dolphins outside back his first chance to play internationally.
The 23-year-old's selection follows a major season in the Dolphins' historic 2026 campaign.
England have named Herbie Farnworth and Morgan Knowles, both experienced internationals, for the tournament.
Isaiya Katoa and Kulikefu Finefeuiaki will represent Tonga, with Katoa expected to direct play from the halves and Finefeuiaki adding strength among the forwards.
Kurt Donoghoe has been selected for Fiji after another strong season with the Dolphins. The versatile utility brings energy and toughness to the squad.
Samoa's selections include three Dolphins: Hamiso Tabuai-Fidow, Francis Molo and Connelly Lemuelu. The trio will add experience as the team prepares to face the world's best.
The 2026 Rugby League World Cup begins Thursday, October 15, with Dolphins players representing five nations.