Flošna, Recreational complex in Hradec Králové, Czech Republic.

Flošna is the local name for the forward casemate buildings, or lunettes, of the Hradec Králové fortress, built in the second half of the 18th century. The two surviving lunettes, Pivovarská and Pajkrova, have an almost square plan of about 25 × 25 m with chamfered corners and stand nearly 6 m high. Their outer walls are of unplastered brick, while the cornices, portals and corners are cut sandstone blocks, and the roof is a roughly 2 m earthen rampart covered with turf.

The three lunettes were built in the second half of the 18th century as part of the Hradec Králové fortress. After the fortress was abolished, the moat was filled in and the ramparts removed; the two surviving lunettes were then rented out and used as warehouses and garages. The Pivovarská flošna, fortification number 39, was long used by the Hradec Králové brewery, which gave it its name.

The name Flošna comes from the French la fléche (arrow), a term soldiers used during the fortress construction; a similar word, Flesche, appears on period plans of the Cheb fortress. The Pivovarská flošna takes its name from the Hradec Králové brewery that long rented it, and a street leading to it bears the same name.

The two surviving lunettes stand near the Flošna swimming pool; the Pivovarská flošna (fortification no. 39) adjoins it directly. Both are cultural monuments in poor condition, so they are seen from the outside. The Pajkrova flošna (no. 40) was to be transferred to the Faculty of Pharmacy of Charles University.

The name Flošna comes from the French la fléche (arrow), a term soldiers used during fortress construction; a similar word, Flesche, appears on period plans of the Cheb fortress. The third flošna stood where Ulrichovo náměstí is today.