| Jurisdiction: | Diocese |
| Eisenstadt | |
| Latin: | Dioecesis Sideropolitanus |
| Local: | Diözese Eisenstadt |
| Coat: | Wappen Bistum Eisenstadt.png |
| Country: |  Austria |
| Metropolitan: | Archdiocese of Vienna |
| Territory: | Burgenland |
| Province: | Vienna |
| Area Km2: | 3,966 |
| Population: | 289,535 |
| Population As Of: | 2019 |
| Catholics: | 191,164 |
| Catholics Percent: | 66 |
| Denomination: | Roman Catholic |
| Rite: | Roman Rite |
| Established: | August 15, 1960 |
| Cathedral: | Cathedral of St Martin and St Rupert |
| Patron: | Saint Martin |
| Metro Archbishop: | Christoph Schönborn |
| Emeritus Bishops: | Paul Iby |
| Map: | Bistuemer oesterreich eisenstadt.png |
| Website: | Website of the Diocese |
The Diocese of Eisenstadt (la|Dioecesis Sideropolitanus) is a Latin Church diocese of the Catholic Church located in the city of Eisenstadt in the ecclesiastical province of Vienna in Austria. The episcopal seat is in Eisenstadt Cathedral.