is a Welsh professional footballer who plays as a left-back and centre-back for Premier League club Tottenham Hotspur and the Wales national team.

Davies is an academy graduate of Swansea City, a Welsh club based in Swansea who play in the English football league system, also joining Danish club Viborg FF's academy while his family lived in Denmark. He made his professional debut for Swansea City in the second Premier League game of the 2012–13 season against West Ham United, scoring his first professional goal in a 3–1 Premier League win against Stoke City in January 2013. In the 2013–14 season, Davies was once again a regular for Swansea City.

In July 2014, Davies was signed by Tottenham Hotspur for an undisclosed fee, making his debut for Tottenham in a Europa League game against Cypriot side AEL Limassol. During Mauricio Pochettino's tenure, Davies battled Danny Rose for the starting left-back spot, but Davies was redeployed as a left-sided centre-back in a defensive back three by Antonio Conte.

Davies made three appearances for the Welsh national U-19 football team in his youth. His appearances all came as part of qualification for the 2012 UEFA European Under-19 Championship. Davies made his debut senior Welsh national team against Scotland at the 2014 FIFA World Cup qualification in 2012. He has since made over 90 senior appearances for Wales, and represented the side at UEFA Euro 2016, reaching the semi-finals, and UEFA Euro 2020. Davies also helped Wales qualify for the FIFA World Cup in 2022, their first tournament appearance since 1958.