Österland

frame|right|Traditional "lands" of Sweden. Different stages of expansion marked by shades. Borders as of year 1700.

Österland () was a medieval term used for the southern part of Finland, one of the four traditional lands of Sweden. The term occurs in documents approximately between 1350–1470 and gradually fell out of use by the end of the 15th century. Before this period the term was used in plural, Österlanden ().