Stari grad, Medieval castle ruin in Sinj, Croatia.

Stari grad is a ruined medieval fortress on a rocky hill above Sinj, at the site of the Illyrian hillfort Ozinij. Its remaining walls were reinforced by the Venetians with earthworks and an outer bailey, the korlat. A small votive Church of Our Lady, built in 1887, stands in the centre of the main fort, and a bronze statue of Our Lady of Sinj by Josip Marinović was placed beside it in 2008.

The fortress is first mentioned in a 1341 charter as Castrum Fsini, and in 1345 as castrum regale Zyn, when King Louis I granted it to Ivan Nelipčić. It stayed with the Nelipčić family, then briefly the Frankopans from 1435 and the Talovci until 1453. Ottoman forces took it in 1516, and Venice captured it in 1686.

The church at the summit, built in 1887, marks the bicentenary of the arrival of the Cetina people from Rama and is dedicated to Our Lady of Sinj as a symbol of their vow to their patroness. A bronze statue of Our Lady of Sinj by sculptor Josip Marinović was placed beside it in 2008. During the Sinjska alka and on the Feast of the Assumption, mačkule, primitive imitations of mortar cannons, sound from the fortress walls.

The path to the summit starts from the foot of the hill and is lined with a fourteen-station Way of the Cross, whose sculptures were made by Croatian artists from 2004 onward. The walls, conserved after research began in 2004, stand above the town. The terrain is uneven, so wear sturdy shoes.

Archaeological research shows that humans inhabited this location as far back as the Copper Age, indicating over 5000 years of continuous settlement. This deep time layer makes the site an important testament to human continuity in the region.