| Marmion Tower | |
|---|---|
| West Tanfield, North Yorkshire, England | |
 Marmion Tower, seen from the east | |
.svg)  Marmion Tower | |
| Coordinates | 54°12′12″N 1°35′37″W / 54.2034°N 1.5937°W grid reference SE266787 |
| Type | Gatehouse |
| Site information | |
| Owner | English Heritage |
| Open to the public | Yes |
| Condition | Ruined |
| Site history | |
| Materials | Magnesian limestone |
Marmion Tower, also known historically as Tanfield Castle, is a 15th-century gatehouse near the village of West Tanfield in North Yorkshire, England. It survived the destruction of the surrounding fortified manor and is now managed by English Heritage.