| Jurisdiction: | Diocese |
| Celje | |
| Latin: | Dioecesis Celeiensis |
| Local: | Škofija Celje |
| Country: |  Slovenia |
| Metropolitan: | Archdiocese of Maribor |
| Province: | Maribor |
| Established: | 7 April 2006 |
| Rite: | Latin Rite |
| Cathedral: | Celje Cathedral (Stolnica svetega Danijela) |
| Area Km2: | 2,711.4 |
| Population: | 289,846 |
| Population As Of: | 2012 |
| Catholics: | 237,370 |
| Catholics Percent: | 81.9 |
| Parishes: | 112 |
| Churches: | 333 |
| Metro Archbishop: | Alojzij Cvikl |
| Bishop: | Maksimilijan Matjaž |
| Emeritus Bishops: | Stanislav Lipovšek |
The Diocese of Celje (Latin: Dioecesis Celeiensis; Slovenian: Škofija Celje) is a Latin Church diocese of the Catholic Church located in the city of Celje in the ecclesiastical province of Maribor in Slovenia.