Örebro Castle is a medieval castle fortification in Örebro, Närke, Sweden. It was expanded during the reign of the royal family Vasa (House of Vasa) and finally rebuilt about 1900. The castle lies on an island in river Svartån. Some of the rooms are used as classrooms for pupils from Karolinska Skolan.

For over 700 years, Örebro Castle has kept a watchful eye on everyone crossing the bridge on the River Svartån. The oldest part of the castle, a defence tower, was erected in the latter half of the 13th century.

This tower was added to in the 14th century to make a larger stronghold, and towards the end of the 16th century most of the impressive castle we see today was built.

The name of Örebro comes from the small stones, that a river transports. In Swedish they are called "ör". The second part of the word comes from the bridge ("bro"), that was built over this ford. Important roads were passing by here - it was a very strategic place, because from here one could control the traffic and the trade in the inner parts of Sweden. In 1364 Albrecht von Mecklenburg captured a fortress in Örebro. Probably that was an antecessor of today's castle, which had been built on the small island within the Svartå (Black river). The fortress is supposed to have consisted of a defence tower with a surrounding wall, but noone knows exactly when it was built. Many important events in Swedish history took place there.[citation needed] For over two hundred years it has been the residence of the county governor, but a great deal is open to the general public, with art, music, food, exhibitions, guided tours, conferences, and lots more.