Bytča (Hungarian: Nagybiccse) is a town in northwestern Slovakia. It is located on the Váh River near the cities of Žilina and Považská Bystrica. It belongs to Upper Váh region of tourism.
The town arose in 1946 by a merger of the settlements Malá Bytča (including Beňov and Mikšová), Veľká Bytča and Hliník nad Váhom. The first written reference to the town's main part Veľká Bytča dates from 1234 as terra Bycha. The settlement got its town charter in 1378. It was the seat of a feudal dominion and later a town with many craftsmen. In Hungarian, it was known as Biccse.
The town features a famous castle the Thurzó Castle built as a water castle by Pongrác Szentmiklósi in the 13th century and rebuilt in the 16th century in Renaissance style by Ferenc Thurzó. The town also houses the Wedding Palace ( built by György Thurzó for his daughters' wedding ) from 1601, which is the only building of this kind in Slovakia, Renaissance, Baroque and Classical bourgeoisie houses, an archive, and a museum (in the Wedding Palace).