| Marmels Castle | |
|---|---|
| Marmorera | |
 The ruins of Marmels Castle | |
  Marmels Castle  Marmels Castle | |
| Coordinates | 46°30′24″N 9°37′18.25″E / 46.50667°N 9.6217361°E |
| Type | Cave Castle |
| Code | CH-GR |
| Height | 1,710 m above the sea |
| Site information | |
| Condition | ruined |
| Site history | |
| Built | around 1100 |
| Materials | rubble stone |
| Garrison information | |
| Occupants | Ministerialis |
Marmels Castle German: Burg Marmels is a ruined castle in the municipality of Marmorera in the district of Albula in the canton of Graubünden in Switzerland.