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.

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. In the summer, it becomes the furthermost Southern station of the Masurian Recreational Navigation system.

As of 2004, the town had a population of 4,934.

• Guzianka Lock, Nida Canal
• Our Lady of Mercy Gate of Dawn church (Kościół Matki Bożej Miłosierdzia Ostrobramskiej) from 1910 (in Ruciane)
• Historical seed extraction plant from late 19th century
• Military bunkers from before the World Wars, early 20th century
• Nature monuments: pine, oak

• 
  Nidzkie Lake with the Nida panorama in the background
• 
  Nida Canal
• 
  Dworcowa Street
• 
  Our Lady of Mercy church

• Puszcza Piska
• Masuria

• Official town webpage
• (in Polish) Biuletyn Informacji Publicznej Urzędu Miasta i Gminy