Nicolai Møller Boilesen (born 16 February 1992) is a Danish professional footballer who plays as a left back for FC Copenhagen in the Danish Superliga, and the Denmark national team.
Boilesen started playing football in local amateur clubs Lille Hema IF and Skovlunde IF in Ballerup and Skovlunde, before joining top-flight club Brøndby IF in 2004. As a left-footed central defender, Boilesen saw Danish senior international and former Brøndby player Daniel Agger as his role-model. Boilesen made his debut for the Denmark national under-17 football team in July 2007, and played a total 38 games for various Danish youth teams in his time at Brøndby.
Having had various trial periods with clubs such as Manchester United, Fiorentina and Chelsea, and with his Brøndby contract expiring in December 2009, Boilesen agreed a move to the Netherlands, with Ajax paying Brøndby 4 million DKK in compensation (roughly €500.000). Followed by a number of top European clubs, Boilesen chose Ajax on advice from fellow Danish youth international and Ajax player Christian Eriksen. Signing a 4-year contract, binding him to the club until the Summer of 2013, he initially joined the youth ranks where his first season with Ajax was stalled by injuries. Once recovered he solidified a starting position for Ajax A1, the clubs' under-19 team, and even made appearances for the reserves team willy Jong Ajax.