House of Cumagne
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| Country | Karnia-Ruthenia, Cumagne, Belgium |
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| Titles | King of Cumagne Prince de Pitcairn Prince de Nison Prince Földvár Duke of Bouvet Count of Larsoya Count of Store-Kari Baron of Gardegloire Baron of Himrodt |
| Founder | HRM King Thomas I |
| Current head | HRM King Thomas I |
| Founding | 01 October 2015 |
The House of Cumagne, or House of Nison was one of the most important royal houses of Karnia-Ruthenia and the most traditional family in Cumagne. The throne of Cumagne was occupied by the family since 2015, when Thomas of Cumagne founded the kingdom. The house also holded several other minor titles.