Franssen is a Dutch patronymic surname meaning "son of Frans". It can refer to:
Everhardt Franßen (born 1937), German judgeJan Franssen (born 1951), Dutch politicianJo Franssen (1909-1995), Dutch politicianJoep Franssen (1899-1975), Dutch racing cyclistM.H.H. Franssen (1903-1981), Dutch lawyerMargot Franssen (born 1952), Dutch-born Canadian philanthropist, activist and entrepreneurNico Valentinus Franssen (1932–1993), Dutch-born American physicist and inventorFranssen effect, an auditory illusion discovered by himFranssens
Joep Franssens (born 1955), Dutch composer