Fersen is a German-language surname. Notable people with the surname include:
Fabian von Fersen (1626-1677), Swedish soldier
Otto Wilhelm von Fersen (1623-1703), Swedish soldier, Fabian's cousin
Hans Reinhold Fersen (1683-1726), Swedish general
Axel von Fersen, Sr. (1719-1794), Swedish politician, son of the above
Ulrika von Fersen (1746-1810), Swedish courtier, niece of the above
Hedvig Eleonora von Fersen (1753-1792), socialite, cousin of the above
Augusta von Fersen (1754-1846), Swedish courtier, cousin of the above
Axel von Fersen, Jr. (1755-1810), Swedish politician, cousin of the above
Sophie von Fersen (1757-1816), Swedish courtier, sister of the above
Fabian von Fersen (1762–1818), Swedish politician, cousin of the above
Jacques d'Adelswärd-Fersen (1880-1923), French novelist and poet, related paternally to Hans Axel
Johann Hermann von Fersen (died 1801), Saxon general in Russian service
Vasili Fersen (1858-1937), Russian Admiral