The title "Duke of Södermanland" is a noble title in the Swedish monarchy, traditionally granted to members of the royal family. It is associated with the province of Södermanland, located in eastern Sweden. The title has historical significance and is part of the Swedish peerage system, which includes various ranks and titles. Currently, the title is held by Prince Carl Philip, the second son of King Carl XVI Gustaf and Queen Silvia. The Duke of Södermanland often participates in royal duties and represents the Swedish monarchy at various events, promoting cultural and charitable initiatives within the region.