Istralandia, Water park in Brtonigla, Croatia.

Istralandia is a water park in the Brtonigla municipality of Istria County, Croatia, near the road from Novigrad to Nova Vas. It covers 81,000 m² and has 20 water slides totaling 1.2 km in length. Its 2,500 m² wave pool is the largest in the Mediterranean, and its tallest slide stands 27 m high.

Istralandia opened in June 2014 as Croatia's first water park, built in Brtonigla municipality near the Novigrad–Nova Vas road. On 25 October 2014 it received a Parksmania award in Rome as new park of the year in Europe. At the 2016 Euro Attractions Show in Barcelona, a 34-member jury ranked it fifth among over 300 European water parks.

The park's name joins Istria with the suffix -landia, and its layout follows an Istrian theme, with slides and pools named after local features. It opened in June 2014 as Croatia's first water park, and in October 2014 it received the Parksmania award for new parks in Europe at a ceremony in Rome.

Istralandia lies on the road between Novigrad and Nova Vas, about 5 km from the Adriatic Sea. It is open to visitors from the end of May to the end of September. The grounds cover 81,000 m2, with 4,500 m2 of water surfaces, so allow time to walk between the wave pool and the slides.

A 34-member international jury at the 2016 Euro Attractions Show in Barcelona ranked Istralandia fifth among more than 300 European water parks. A year earlier, in Rome on 25 October 2014, it took a Parksmania award for new parks in Europe.