Rasmus Schmidt Nicolaisen (born 16 March 1997) is a Danish professional footballer who plays as a centre-back for Ligue 1 club Toulouse.

He made his first professional appearance with the club on 7 March 2017 in a Danish Cup game against Kjellerup IF, coming off the bench to replace Kian Hansen in a 3-0 win.

On 16 April 2017, Nicolaisen made his Superliga debut against Lyngby BK, once again replacing Hansen, this time in a 2-2 draw.

On 23 September 2020, Nicolaisen joined EFL League One club Portsmouth on a season-long loan deal.

[3][4] He scored his first goal for Portsmouth in a 6–1 FA Cup win against King's Lynn Town on 28 November 2020.