Omišalj (Italian: Castel Muschio; German: Moschau) is a coastal municipality in the north-west of the island of Krk in Croatia.

[7] Omišalj is located close to one of the oldest settlements on Krk, dating from the 1st century when it was built by the Romans and named Fulfinum.

Omišalj was first mentioned in 1153 and is one of the oldest places on the island of Krk, an important Glagolitic and cultural center.

The land between the castles of Dobrinj and Omišalj, as well as the areas in and around Dubašnica and Poljica, were settled by Vlachs and Morlachs (originally Romanians who later diverged into Istro-Romanians) by Ivan VII Frankopan during the second half of the 15th century.

"[12] The performances take place on Prikešte Square in Omišalj and in the old castle in the town of Grobnik, Primorje-Gorski Kotar County.