Samogitia or Žemaitija (Samogitian: Žemaitėjė; Lithuanian: Žemaitija; see below for alternative and historical names) is one of the five ethnographic regions of Lithuania and formerly one of the 2 core administrative divisions of the Grand Duchy of Lithuania alongside Lithuania Proper. Žemaitija is located in northwestern Lithuania.Its largest city is Šiauliai.

Samogitian uprisings refer to two uprisings by the Samogitians against the Teutonic Knights in 1401–1404 and 1409. Samogitia was granted to the Teutonic Knights by Vytautas the Great, Grand Duke of Lithuania, several times in order to enlist Knights' support for his other military affairs.The local population resisted Teutonic rule and asked Vytautas to protect them.