Nicolaysen

Nicolaysen is a surname. Notable people with the name include:


 * Nicolay Nicolaysen (1817–1911), Norwegian archaeologist
 * Julius Nicolaysen (1831–1909), Norwegian professor of medicine
 * Nicolay Nicolaysen Sontum (1852–1915), Norwegian engineer, businessperson and contractor
 * Wilhelm Nicolaysen (1869–1944), Norwegian barrister and businessperson