Nicolaisen or Nikolaisen is a surname. The following individuals have the surname:
Donald Nicolaisen, American politician Elvira Nikolaisen (born 1980), Norwegian singer/songwriter Emil Nikolaisen (born 1977), Norwegian musician and producer Kaia Wøien Nicolaisen (born in 1990), Norwegian biathlete Petra Nicolaisen (born 1965), German politician Rasmus Nicolaisen (born 1997), Danish footballer W. F. H. Nicolaisen (1927–2016) German folklorist, linguist, medievalist, and scholar
See also Nicolaysen, surname