Sighetu Marmației (Romanian pronunciation: [ˌsiɡetu marˈmat͡si.ej], also spelled Sighetul Marmației; German: Marmaroschsiget or Siget; Hungarian: Máramarossziget, Hungarian pronunciation: [ˈmaːrɒmɒroʃsiɡɛt] (listen); Slovak: Sihoť; Ukrainian: Сигіт Syhit; Yiddish: סיגעט Siget), until 1964 Sighet, is a city (municipality) in Maramureș County near the Iza River, in northwestern Romania.
Sighetu Marmației is situated along the Tisa river on the border with Ukraine, across from the Ukrainian town of Solotvyno. Neighboring communities include: Sarasău, Săpânța, Câmpulung la Tisa, Ocna Șugatag, Giulești, Vadu Izei, Rona de Jos and Bocicoiu Mare communities in Romania, Bila Cerkva community and the Solotvyno township in Ukraine (Zakarpattia Oblast). The city administers five villages: Iapa (Kabolapatak), Lazu Baciului (Bácsiláz), Șugău (Sugó), Valea Cufundoasă (Mélypatak) and Valea Hotarului (Határvölgy).
The city's name derives from Hungarian name which means "island in Máramaros".