The Södermanland Regiment (Swedish: Södermanlands regemente), designated P 10 or P 3 and P 10/Fo 43, was an armored regiment of the Swedish Army with its roots in the 17th century, and was located in Strängnäs. The regiment was deactivated in 2004 and its assets were funneled into other parts of the military. Its life company was transferred to the of the Home Guard, making the Södermanland Group the only Home Guard unit with such a company.