St. Bernardino Church, Abbey church ruin in Bernardin resort, Piran Municipality, Slovenia

St. Bernardino Church is a ruin standing near the Adriatic coast with preserved stone walls and arches that show medieval construction methods. The site still displays clear architectural features of its original design.

John of Capistrano, vicar general of the Observants, agreed in 1450 to found a friary outside Piran's walls at the request of its citizens. The monastery and church of St Bernardino of Siena were completed and settled in 1452. The monastery was suppressed in 1806, and Austrian troops turned the buildings into a fortress for the bay in 1830.

The church is named after St. Bernardino of Siena, teacher of St. John Capistrano, who founded the monastery in 1452. A chapel of Our Lady of Grace was consecrated around 1490. Bishop Paolo Naldini wrote in 1700 that the church was large and bright, with marble altars and precious paintings. The monastery was suppressed in 1806 and the buildings later served as a fortress.

The remains stand on a platform of the Bernardin hotel complex, where the Gothic presbytery, the pointed chancel arch and the Baroque bell tower with its single bell are visible. The site is open and can be viewed at any time; the hotel grounds are reached on foot from the Portorož seafront. No roof or stairs were added to the ruin.

The church was built in 1452 by St. John Capistrano, a Franciscan Observant preacher who agreed in 1450, at the request of the people of Piran, to found a friary outside the town walls. The site was later turned into an Austrian fortress in 1830, and the surviving presbytery and bell tower were moved onto the hotel complex's terrace in 1976.