William St Lawrence W. Collier (born 5 May 1991) is an English rugby union player who plays as a tighthead prop for Harlequins in the Gallagher Premiership. A front row specialist that cites his interest in the 'dark arts' (of scrummaging) inspired in part by Chris Ritchie, a veteran London Welsh player and Joe Launchbury, a current England Rugby international. He made his England Test debut against Argentina on 10 June 2017 and made a second appearance a week later in the deciding match, scoring a try. England won the Argentina tour, June 2017; two test matches to nil.