Mathias Nielsen
Mathias Nielsen is the name of the following people:
- Mathias Nielsen (soccer player, 1991) ( Mathias Aaris Kragh Nielsen ; * 1991), Danish soccer player
- Mathias Nielsen (soccer player, 1997) ( Mathias Lautrup Nielsen ; * 1997), Danish soccer player
- Mathias Møller Nielsen (* 1994), Danish racing cyclist