Per Lundgren Nielsen (Danish pronunciation: [ˈpʰɛɐ̯ ˈne̝lsn̩]; born 15 October 1973) is a Danish former professional footballer who played in the central defense of Brøndby IF in the Danish Superliga for his entire club career. With Brøndby, Nielsen won five Danish championships and three Danish Cups since his senior debut in 1993. He played 547 official games for Brøndby IF and scored 26 goals, and from 2002 to 2008 he was named team captain. He played 10 matches for the Denmark national football team and is noted for 19 matches for the national under-21 team from 1994 to 1996. Following his retirement, he has worked as first as an assistant coach, later as head coach. Since 2015 he has been coaching Brøndby's women's team.