The Canal of Castile is a canal in the north of Spain. Constructed between the last half of the 18th century and the first half of the 19th century, it runs 207 km through the provinces of Burgos, Palencia and Valladolid, in the Autonomous Community of Castile and León. Width ranges between 11 m and 22 metres, depth between 1.8 m and 3 metres.
It is protected by a heritage listing, having been declared Bien de interés cultural in 1991. Parts of it are still in use, although there are now only limited possibilities for navigation: it irrigates 48 municipalities.