Häme Castle is a medieval castle in Hämeenlinna, Finland. The castle is located on the coast of lake Vanajavesi in the city center. The castle was originally located on an island. The castle's age is disputed. Traditionally the construction of the castle has been connected to the legendary Second Swedish Crusade which would date the castle in the mid-13th century.
However, there are no finds from the castle that can be firmly dated to a period earlier than 1320s. Also the contents of the crusade legend have been seriously contested. An earlier fortification from about 1300 only some 20 kilometres (12 mi) away in Hakoinen also makes a 14th century dating for Häme Castle more probable. Only one castle ("Tauestahus") is listed in Tavastia in a royal document from 1308. Also, the Russian Novgorod Chronicle only mentions one castle during their plundering of Tavastia in 1311, its description matching well with the castle in Hakoinen.