Slottslän was an administrative division in Sweden and Finland (formerly part of Sweden) from late 13th century to 1634. The term slottslän can be translated as "castle fief". Although the word "län" literally means fief, in Sweden it is translated as "county" and in Finland as "province".

Slottslän was an administrative division in Sweden and Finland (formerly part of Sweden) from late 13th century to 1634. The term slottslän can be translated as "castle fief". Although the word "län" literally means fief, in Sweden it is translated as "county" and in Finland as "province".