| Twthill Castle | |
|---|---|
| Rhuddlan, Denbighshire, Wales | |
 Twthill Castle | |
  Twthill Castle | |
| Coordinates | 53°17′11″N 3°27′45″W / 53.2864°N 3.4625°W |
| Grid reference | grid reference SJ026776 |
| Type | Motte and bailey |
| Site information | |
| Owner | Cadw |
| Open to the public | Yes |
| Condition | Earthworks remain |
Twthill (Welsh: Twtil) is a Norman castle located near the town of Rhuddlan, Denbighshire in Wales; historic names for the site include Toothill and Tot Hill Castle and it is also known as Old Rhuddlan Castle. It is a motte-and-bailey castle and was later replaced by the much larger, stone-built Rhuddlan Castle. The only remaining visible signs of the old castle are the large mound of the motte, and traces of the wall that surrounded the bailey.