Liam Scales (born 8 August 1998) is an Irish professional footballer who plays as a centre-back or a left-back for Scottish Premiership club Celtic and the Republic of Ireland national team.

[22] Scales made his league debut on 5 December 2021, coming on as a substitute to score the third goal in Celtic's 3–0 away win at Dundee United.

[25] This transfer caused controversy amongst a section of the Aberdeen support, who launched criticism at their board for continuing to sign players on loan from Celtic.

Aberdeen manager Jim Goodwin defended his signature, with him stating that: "I'm a big fan of the loan market as it gives you the opportunity to sign players that you would maybe not normally be able to afford.

[28] Four months later he was shown red again in a 6–0 loss against the same opposition, a result that saw manager Jim Goodwin removed from his position shortly after the match.

[37] He was called up to the Republic of Ireland senior team for the first time on 3 September 2021 alongside Alan Browne and Callum Robinson for the games against Azerbaijan and Serbia, with the trio replacing the injured Dara O'Shea, Nathan Collins and Shane Long.

[38] On 19 September 2022, Scales was called up again for UEFA Nations League group matches against Scotland and Armenia after Andrew Omobamidele was ruled out due a groin injury.

[41] Republic of Ireland manager Stephen Kenny revealed on 7 November 2023 that Scales would be called up again as part of the squad to play against The Netherlands and New Zealand.