| House of Nagymartoni | |
|---|---|
 | |
| Country | Kingdom of Aragon Kingdom of Hungary Duchy of Austria |
| Founded | 1202 |
| Founder | Tota |
| Final ruler | William |
| Estate(s) | Nagymarton, Bajót, Fraknó, Kabold, Lánzsér, Trausdorf |
| Dissolution | 1446 |
| Cadet branches | after 1346: "German" and "Hungarian" branches |
The Nagymartoni or Martinsdorfi (also Bajtói, and later Fraknói; German: von Mattersdorf, later von Forchtenstein) was a noble family in the Kingdom of Hungary of Aragonese origin, which existed from the early 13th century to the mid-15th century. In the last period of their existence, they were subjects of the Duke of Austria too.