Andreasen and the parallel form Andresen (Norwegian cognate Andreassen) are Danish-Norwegian patronymic surnames meaning "son of Andreas". It has a similar origin as the name Andersen. Notable people with the surname include:

Christian Andreasen (born 1988), Danish footballer Dagmar Andreasen (1920–2006), Danish businesswoman and politician Emil Andreasen (1895–1972), Danish boxer George Andreasen (1934–1989), American orthodontist Heidi Andreasen (born 1985), Faroese paralympic swimming silver medalist Jakob Andreasen (handball coach) (born 1976), Danish handball coach Lawrence Andreasen (1945–1990), American athlete Leon Andreasen (born 1983), Danish footballer Marta Andreasen (born 1954), Argentina-born member of the European Parliament Nancy Coover Andreasen (born 1938), American neuroscientist Rannvá Andreasen (born 1980), Faroese association footballer   Søren Andreasen (born 1996), Danish footballer

See also Andresen Andersen Andreessen (disambiguation) Andriessen Andreassen Andreasson

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