Oldambt (Dutch pronunciation: [ɔlˈdɑm(p)t])[6] is a municipality with a population of 38,277 in the province of Groningen in the Netherlands.

It contains the city of Winschoten and these villages: The name "Oldambt" from "Ol dambt" meaning "the old fill" is derived from land reclamation efforts, starting after the catastrophic floodings of the 13th century.

The municipality contains the city of Winschoten, the villages of Bad Nieuweschans, Beerta, Blauwestad, Drieborg, Finsterwolde, Heiligerlee, Midwolda, Nieuw-Beerta, Nieuwolda, Nieuw-Scheemda, Oostwold, Scheemda, 't Waar, and Westerlee,[9] and the hamlet Hongerige Wolf.

[10] In the north of the municipality is part of the Dollart in the Wadden Sea, which is a UNESCO World Heritage Site since 2009.

The highway A7 (E22) connects the municipality to the city of Groningen in the west and Leer (Germany) in the east.