Ruhnu  is a small island in Estonia, isolated from the rest of the country in the Gulf of Riga.
The island is called Runö in Swedish.
Ruhnu Airport operates regular flights to Pärnu and Kuressaare.
- St. Madeline's Church in Ruhnu. It's the oldest known wooden building still standing in Estonia - its construction was started in 1643.
- Ruhnu's New Church. The new church was build only two meters from the old wooden church. The walls of the church are made from rocks and the church tower from wood. The church bell is one of the oldest in Estonia.
The island is popular with hikers and swimmers, the best beach for swimming is Limo beach, with its "singing" sands.