Lasse Nielsen

Lasse Nielsen may refer to:


 * Lasse Nielsen (footballer, born 1987), Danish footballer who plays for Lyngby BK
 * Lasse Nielsen (footballer, born 1988), Danish footballer who plays for Malmö FF
 * Lasse Nielsen (canoeist) (born 1984), Danish sprint canoeist
 * Lasse Nielsen (filmmaker), Danish filmmaker; writer and director of Leave Us Alone, You Are Not Alone (co-writer, co-director), etc.