Map - Omiš (Grad Omiš)

Omiš (, Latin and Almissa) is a town and port in the Dalmatia region of Croatia, and is a municipality in the Split-Dalmatia County. The town is situated approximately 25 km south-east of Croatia's second largest city, Split. Its location is where the Cetina River meets the Adriatic Sea. Omiš municipality has a population of 14,936 and its area is 266 km².

It is supposed that the name of this city, Omiš, developed from the Slavic Holm, Hum as a translation from the Illyrian - Greek word Onaion, Oneon, meaning "hill" or "place on the hill", or from Greek onos (όνος) meaning donkey, perhaps from the shape of the rocky promontory by the city (naming a city after a natural form was common practice then, as it is now); there is also the possibility that the name of the settlement Onaeum was derived from the name of the river which was called Nestos by the Greek colonists in its lower flow, during Antiquity. According to Petar Šimunović, Omiš is derived from Proto-Indo-European *almissa ("rock", "cliff").

Latin names during Ancient Rome were Onaeum, Oeneum, Alminium, and Almissum. During Medieval times the name was recorded as Olmissium, Almiyssium and from the end of the 15th century, when the city fell to the authority of Venetian Republic, its name was the Italian Almissa.