Ruciane-Nida [ruˈt͡ɕanɛ ˈɲida] is a town in Pisz County, Warmian-Masurian Voivodeship, Poland, with 4,934 inhabitants (2004). The town was formed in 1966 by the merger of three smaller settlements: Ruciane (German: Rudczanny, renamed Niedersee in 1938), Nida (German: Nieden), and Wola Ratajowa. The town of Ruciane-Nida is a well-known tourist centre within the Masurian Lake District, with a popular railway line running through it: a D29-219 line – Olsztyn – Szczytno – Świętajno – Pisz – Ełk.