Mathiassen

Mathiassen may refer to:


 * Erik Mathiassen Enge (1852–1933), Norwegian politician
 * Samuel Mathiassen Føyn (1786–1854), Norwegian ship-owner and politician
 * Idar Mathiassen (born 1976), Norwegian footballer
 * Therkel Mathiassen (1892–1967), archaeologist, anthropologist, cartographer and ethnographer
 * Gotskalk Mathiassen Seim (1818–1873), Norwegian politician