Aiden Connor O'Neill (born 4 July 1998) is an Australian professional soccer player who currently plays as a defensive midfielder for Standard Liège and the Australia national team.

[7] He made his professional debut for the club on 20 August 2016, coming on as a late substitute against Liverpool in the Premier League as Burnley won 2–0.

[8] He made his full debut days later, starting in an extra time loss to Accrington Stanley in the EFL Cup.

[13] In August 2018, O'Neill returned to Australia to play for Central Coast Mariners in the A-League on a season-long loan.

During the Melbourne Derby on the 17 December 2022, O'Neill scored the opening goal during the match, that was later abandoned due to player safety in the 22nd minute.

On February 3, 2024, O'Neill received his first international red card against South Korea in extra-time at the quarter-finals of the 2023 AFC Asian Cup.