William Robert Vaulks (born 13 September 1993) is a professional footballer who plays as a midfielder for EFL Championship club Oxford United and the Wales national team. He began his professional career at Tranmere Rovers in 2012 but did not make a senior appearance, going on loan to Workington of the Conference North before joining Scottish club Falkirk in February 2013. He played 142 games for the club, including the 2015 Scottish Cup Final and two Scottish Championship play-off finals. In 2016 he joined Rotherham United for an undisclosed fee, where he was Player of the Season as they won the League One playoffs in 2018. In 2019, he signed for Cardiff City, and three years later Sheffield Wednesday. In March 2019 he made his debut for the Welsh national team whom he qualifies for through his mother.