John Lacey is a former Ireland A and Ireland Sevens rugby union international and current rugby union referee. As a player, Lacey spent most of career with Shannon in the All-Ireland League. He also represented Munster. As an international referee he has taken charge of matches in the Six Nations Championship, the Rugby Championship and the Rugby World Cup. He also refereed the 2013 Pro12 Grand Final and the 2015–16 and 2016–17 European Rugby Challenge Cup finals.

The Ireland national rugby sevens team competes in several international rugby sevens competitions. The team is governed by the Irish Rugby Football Union (IRFU).