Olomouc Fortress, Military fortress in Olomouc, Czech Republic.

Olomouc Fortress is a bastion fortification whose main surviving elements are the Terezská Gate, a brick baroque structure with stone sculpture under a grass-covered top, and the Židovská Gate, which still shows the slots that held its drawbridge. Earth ramparts, ravelins and outworks surround the historic core, and the flat clearing in the city holds two long pale-walled buildings with dark roofs beside a red running track.

Olomouc was declared a fortress by Emperor Ferdinand III on 15 September 1655, with Locatello de Locatelli as its first commander. After Swedish occupation (1642–1650), Maria Theresa ordered a full bastioned enceinte built between 1742 and 1757 to plans by engineer Pierre Philippe Bechade de Rochepine. The Prussians besieged it for five weeks in 1758 without success; the fortress was abolished in 1886.

The Terezská brána on třída Svobody, a brick baroque gate from the 18th century with stone sculpture, survives covered by green turf, while the Židovská brána keeps its drawbridge slots. The yearly fortification days recall the 1758 siege, when Prussians under Frederick II withdrew after Daun's relief and the loss of supply convoys at Gundersdorf and Domstadtl.

The bastion ring survives only in fragments: the Terezská Gate on třída Svobody, the Jewish Gate in Univerzitní street and the Michalský výpad tower can be picked out on foot. The map marked Pevnost Olomouc traces a numbered route of 26 points across the former circuit. The flat clearing with two long pale buildings and the red running track lies on the site of the razed defences.

The Terezská brána on třída Svobody survives as a baroque brick gate covered with green turf, and the Židovská brána still shows the slots that once held its drawbridge chains. The Hradská brána was demolished in 1876 to make way for the Dómská čtvrť near the railway station.