Eilertsen is a surname. Notable people with the surname include:
Eilert Eilertsen (1918–2014), Norwegian footballer and politician Kristian Eilertsen (born 1994), Norwegian politician Maryon Eilertsen 1950–2015), Norwegian actress Mats Eilertsen (born 1975), Norwegian musician and composer Nikolai Eilertsen (born 1978), Norwegian bass guitarist Trine Eilertsen (born 1969), Norwegian newspaper editor