Matti Lund Nielsen (born 8 May 1988) is a former Danish professional footballer who played as a midfielder.

Nielsen made his professional debut for OB on 4 March 2007 in the Royal League game against Lillestrøm.

[2] In December 2009, Nielsen signed a two-and-a-half-year contract with Danish Superliga club Nordsjælland starting from 1 January 2010.

[4] On 19 September 2015, OB announced that Nielsen was signed for the remainder of the calendar year.

[5] On 7 January 2020, he returned to Italy, signing a one-and-a-half-year contract with Serie C club Reggina.