Košťál, Mountain summit in Northern Bohemia, Czech Republic.

Košťál is a 481 m conical hill above Třebenice in the southern Bohemian Central Mountains. Its lower slopes are breccia, while the upper part is trachybasalt and basanite rock, giving a rocky summit unlike the rounded neighbouring hills. On the summit stand the remains of the Gothic castle Košťálov, chiefly its rectangular donjon.

The Gothic castle Košťálov was probably built at the start of the 14th century to secure the estates of St. George's Convent in Prague. Its first written mention dates from 1372, when lightning struck and singed the boots of the burgrave Alesch von Slavietin. From the 15th century the Kaplirz zu Sulewicz held it, and by the early 17th century it was described as deserted.

The name Košťál is often applied to the whole hill after the Gothic castle Košťálov on the summit, first documented in 1372. The south and east slopes have been a protected natural monument since 1960, preserving heat-loving plants such as spring pheasant's eye and Bohemian pasqueflower.

A red-marked hiking trail leads from Třebenice up to the ruin on the summit, where the view opens over the surrounding hills. The south and southeast slopes above the town are a protected nature monument, so walkers stay on the marked path. The climb is short but steady on rocky ground.

The hill was once called Přípek, and Cosmas of Prague mentions it in the Chronica Boemorum in his account of the Wiesenkrieg of the Přemyslids against the Lutschanen. The name Košťál now refers both to the 481 m hill and to the Gothic castle ruin on its summit.