Mostar is a city and municipality in Bosnia and Herzegovina, the largest and one of the most important cities in the Herzegovina region and the center of the Herzegovina-Neretva Canton of the Federation. Mostar is situated on the Neretva river and is the fifth-largest city in the country. Mostar was named after the bridge keepers (natively: mostari) who in the medieval times guarded the Stari Most (Old Bridge) over Neretva river. The Old Bridge, built by the Ottomans in the 16th century, is one of the city's most recognizable landmarks.

Human settlements on the river Neretva, between the Hum Hill and the Velež Mountain, have existed since prehistory, as witnessed by discoveries of fortified enceintes and cemeteries. Evidence of Roman occupation was discovered beneath the present town.

As far as the medieval Mostar goes, although the Christian basilicas of late antiquity remained in use, few historical sources were preserved and not much is known about this period. The name of Mostar was first mentioned in a document dating from 1474, taking its name from the bridge-keepers (mostari); this refers to the existence of a wooden bridge from the market on the left bank of the river which was used by traders, soldiers, and other travelers. During this time it was also the seat of a kadiluk (district with a regional judge). Since Mostar was on the trade route between the Adriatic and the mineral-rich regions of central Bosnia, the settlement began to spread to the right bank of the river.