Kai O'Donnell (born 21 February 1999) is an Australian professional rugby league footballer who plays as a second-row forward for the North Qld Cowboys in the NRL.

[6] In February 2019, O'Donnell came off the bench in the Gold Coast Titans pre-season trial loss to the North Queensland Cowboys.

[7] In April 2019, he made a mid-season move to the Canberra Raiders, joining their Jersey Flegg Cup side and starting at second-row in their Grand Final loss to the South Sydney Rabbitohs.

[12] In the 2023 Challenge Cup quarter-final, O'Donnell was sent off for a spear tackle in Leigh's 34-14 victory over York RLFC.

[14] O'Donnell played 22 games for Leigh in the 2023 Super League season as the club finished fifth on the table and qualified for the playoffs.