Ruciane-Nida [ruˈt͡ɕanɛ ˈɲida] is a town in Pisz County, Warmian-Masurian Voivodeship, Poland. 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. It is located within the historic region of Masuria. As of 2004, the town had a population of 4,934.