Castle Březina, Gothic castle ruins in Březina, Czech Republic.

Castle Březina is a ruin in the castle park above the swimming pool in Březina, Rokycany District, at 500 m elevation. At its centre stood a donjon with rounded corners, its eastern corner slightly elongated toward possible shelling; a neck ditch protected the fortified area. Romantic modifications around 1810 and later quarrying removed the other buildings and halved the original area.

Founded on a rocky promontory in the 14th century, the castle was first documented in 1389, when it belonged to Jindřich of Elsterberk. Petr Malovec bought it in 1642 while it was still habitable; by 1661 it was recorded as deserted, and he built a modest two-storey residence in the adjoining farmyard. In 1810 the Šternberks, seated at the nearby chateau, converted the ruined residential tower into a neo-Gothic gazebo.

The name Březina comes from the birch trees (bříza) that gave the village and castle their name. The ruin stands in the castle park above the village swimming pool, and since 1810 the remains of the residential tower have served as a neo-Gothic gazebo built by the Šternberk family from the nearby chateau.

Well-marked hiking trails lead from the village of Březina in Rokycany District to the ruins. The climb is manageable for visitors with average fitness levels.

The castle's original area was up to twice today's size; the northern part was quarried away during romantic landscaping in the early 19th century. The donjon's eastern corner is slightly elongated toward a possible line of fire.