Södermanland County (Södermanlands län) is a county or län on the southeast coast of Sweden. It is often shortened and pronounced as Sörmlands län, or simply Sörmland. It borders the counties of Östergötland, Örebro, Västmanland, Uppsala, and to the Baltic sea. It holds the popular camping route called "Sörmlandsleden" which is a system of trails covering a total of approximately 100 mil (1000 km) of walking paths, in Södermanland.

It is an administrative unit, covering most of the province Södermanland. The eastern parts of the Södermanland province, largely corresponding to the Södertörn area, belong to .

The main aim of the County Administrative Board is to fulfil the goals set in national politics by the Riksdag and the Government, to coordinate the interests of the county, to promote the development of the county, to establish regional goals and safeguard the due process of law in the handling of each case. The County Administrative Board is a Government Agency headed by a Governor. See List of Södermanland Governors.

Södermanland runs between the lake Mälaren to the north and the Baltic Sea to its east and south. There is a large distance between the two main urban areas Eskilstuna and Nyköping of roughly 80 kilometres (50 mi), and vast forested areas in between. The centre of Södermanland is spread out between four municipality seats namely Vingåker, Katrineholm, Flen and Gnesta that separate the southern and northern areas of the county. Most parts are low-lying being part of the Mälar valley, but some higher areas can be found.

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