HSwMS Södermanland explained

Six warships of Sweden have been named Södermanland, after Södermanland:

• , a warship launched in 1651.
• , a warship launched in 1693.
• , a galley launched in 1749.
• , a warship launched in 1750.
• , a launched in 1956 and stricken in 1982.
• , a launched in 1988 and since in active service.