This article discusses the Lithuanian part of the region. For the Polish one, see Suwałki Region (Suwalszczyzna).

Suvalkija or Sudovia (Lithuanian:Sūduva or Suvalkija or Užnemunė, Polish:Suwalszczyzna) is the smallest of the five cultural regions of Lithuania. Its unofficial capital is Marijampolė. People from Suvalkija are called suvalkiečiai (plural) or suvalkietis (singular). It is located south of the Neman River, in the former territory of Vilkaviškis bishopric. Historically, it is the newest ethnographic region as its most distinct characteristics and separate identity formed during the 19th century when the territory was part of Congress Poland. It was never a separate political entity and even today it has no official status in the administrative division of Lithuania. However, it continues to be the subject of studies focusing on Lithuanian folk culture of the 19th and early 20th centuries.