Kula Norinska Fort, Stone fort in Metković, Croatia.

Kula Norinska Fort is a stone structure located beside the Neretva River in Metković, with walls that rise roughly 14 meters and encircle the central defensive space. The fort displays the typical features of a medieval military stronghold, built with thick stone masonry to withstand attacks from the water and land.

The fort was built around 1500, shortly after the Ottomans took the Neretva valley, to block Venetian ships from entering the river. The traveller Evliya Çelebi, who passed through in 1665, names its builder as Kodža Mustafa-paša Ušćuplija and describes a tower of seven storeys. In 1685 Venetian forces under provveditore Pietro Valier took it and raised their banner.

The village on the opposite bank of the Neretva took its name from the fort and is now the seat of the Kula Norinska municipality. The fort appeared on the old coat of arms of the former Opuzen municipality and still features on the coat of arms of the town of Opuzen.

The fort stands right beside the main road at the entrance to Metković, opposite the mouth of the Norin, so it is easy to find by car. The structure is neglected and overgrown with ivy, and the ground around it is uneven, so wear sturdy shoes. It is a protected cultural good, but there are no visitor facilities on site.

Evliya Çelebi, who passed through Bosnia twice in 1660 and 1665, described the tower as having seven floors and named its builder as Kodža Mustafa-paša Ušćuplija (Skopljak), commander of Sultan Mehmed I's army in Bosnia. Local tradition holds that two floors sank into the marshy ground, while others believe the upper two were demolished.