Gregersen is a North German, Danish and Norwegian patronymic surname, literally meaning "son of Gregers". It is an unusual surname in Denmark, shared by little more than 5,800 persons.
It may refer to:Atli Gregersen, Faroese footballer
Hans Gregersen, Danish bioengineer
Harry Gregersen (1901–1970), Danish coxswain
Jacob Gregersen, Danish retired footballer
Jesper Gregersen, Norwegian footballer
Mette Gregersen, Danish cricketer
Peter K. Gregersen, American geneticist
Stian Rode Gregersen, Norwegian professional footballer
Gudbrand Gregersen de Saág (1824–1910), Norwegian-born Hungarian bridge engineer, architect