Rehn is a Scandinavian surname, also used in Finland.
Elisabeth Rehn, Finnish politician, the country's first female Minister of DefenceFrank Knox Morton Rehn, American artistOlli Rehn, Finnish politician, European Commissioner for Economic and Monetary Affairs and the euroStefan Rehn, Swedish football player and managerTrista Rehn, Trista Nicole Sutter (née Rehn), the first BacheloretteVictor Rehn, physicist, former Director Office of Naval Research, Asia-Pacific.