Kastav (Italian: Castua) is a town in Primorje-Gorski Kotar County, Croatia, built on a 365 m high hill overlooking the Kvarner Gulf on the northern coast of the Adriatic.

It is in close vicinity of Rijeka, the largest port in Croatia, and the Opatija Riviera, one of the popular tourist destinations in the country.

A valuable archaeological site is the Illyrian necropolis found in the Mišinci karst valley at the foot of the town.

From Saint Anthony’s Day on 17 January (Antonja) until Ash Wednesday (Pusna sreda) there are carnival dances every Saturday named pusni tanci.

Carnival ends on Ash Wednesday with the burning of the straw effigy (Pust) who serves as the culprit blamed for all the misfortunes that had happened in the past year.

As along with many other towns situated at the meeting point of Central Europe and the Mediterranean, Kastav has a rich tradition and a recognisable identity.

Since the Republic of Croatia declared its independence and the town of Kastav regained its position as an independent district the bearers of the town's progress have become small and medium-sized enterprises who enjoy favourable conditions for expansion, especially thanks to the vicinity of Rijeka and Opatija - the commercial and tourist centres of the region.

Kastav is also known for its festival of new wine, the traditional Bela Nedeja which takes place on the first Sunday in October, then its carnival, which starts on 17 January (the Feast of St. Anthony), various concerts of brass bands, meetings of accordionists and winemakers, and numerous art exhibitions.

Yasna Skorup Krneta: Ambient art installation – objects made of metal and discarded items – displayed in the old town of Kastav, in front of Crekvina.

As a result, with funds provided by The Academy for Educational Development three tracks through Kastav woods of Loza and Lužina were created and opened in 2005 on World Walking Day.