Avellan is a surname. Notable people with the surname include:
David Avellan, American professional mixed martial artist Electra and Elise Avellan, twin sisters and Venezuelan actresses Elizabeth Avellan (born 1960), American film producer born in Caracas, Venezuela Enrique Avellán Ferrés (1904–1984), Ecuadorian novelist Henrik Avellan (1902–1991), Finnish pentathlete Teodor Avellan Fyodor Avelan (1839–1916), Finnish-born Russian admiral Viivi Avellan (born 1977), Finnish journalist and television hosting entrepreneur