Marco Lund Nielsen (born 30 June 1996) is a Danish footballer who plays for Hungarian club Diósgyà Âr.
Marco Lund began his senior career in Danish Esbjerg before moving to Odense in 2018. On 21 January 2021, it was announced that Lund had signed a contract with IFK Norrköping valid from 1 July 2021. On 8 February, it was announced that Lund would join IFK Norrköping directly. On 12 January 2024, Lund was signed by Hungarian Diósgyà Âri VTK.