Gunnar Nielsen

Gunnar Nielsen may refer to:


 * Gunnar Nielsen (actor) (1919–2009), Swedish film actor
 * Gunnar Nielsen (athlete) (1928–1985), Danish athlete, former world record holder over 1500 metres
 * Gunnar Nielsen (Argentine footballer) (born 1983), Argentine football midfielder
 * Gunnar Nielsen (Faroese footballer) (born 1986), Faroese football goalkeeper