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. Scales is from Barndarrig, County Wicklow. He studied Irish and geography at University College Dublin. He is a fluent Irish speaker. Scales was a Republic of Ireland under-21 international, winning six caps. 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. 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. He was recalled by Ireland in October 2023. On 13 October 2023, he made his senior international debut for the Republic of Ireland in a 2–0 defeat at against Greece at the Aviva Stadium. 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.