| Cephalonia Prefecture | |
| Native Name: | Nomós Kefallenías (Νομός Κεφαλληνίας) |
| Settlement Type: | Former prefecture |
| Image Map1: | Kefallinia muncipalities numbered.png |
| Map Caption1: | Location of municipalities within Cephalonia Prefecture Prefecture |
| Subdivision Type: | Country |
| Subdivision Name: | Greece |
| Subdivision Type1: | Periphery |
| Parts Type: | Subdivisions |
| P1: | 3 provinces |
| P2: | 8 municipalities |
| P3: | 1 community |
| Seat Type: | Capital |
| Seat: | Argostoli |
| Unit Pref: | Metric |
| Area Total Km2: | 904 |
| Area Rank: | 49th |
| Population Total: | 42088 |
| Population As Of: | 2005 |
| Population Density Km2: | auto |
| Population Density Rank: | 33rd |
| Population Rank: | 50th |
| Postal Code Type: | Postal codes |
| Postal Code: | 28x xx |
| Area Code Type: | Area codes |
| Area Code: | 267x0 |
| Iso Code: | GR-23 |
| Registration Plate: | ΚΕ |
| Website: | www.kefalonia.eu |
The Cephalonia Prefecture (Greek, Modern (1453-);: Νομός Κεφαλληνίας) was a prefecture in Greece, containing the Ionian islands of Cephalonia and Ithaca. In 2011 the prefectural self-government was abolished and the territory is now covered by the regional units of Cephalonia and Ithaca.
It was previously divided into 3 eparchies (provinces), and one independent municipality, Ithaca:
The prefecture was divided into eight municipalities and one community:
All of the preceding are on the Cephalonia island, except Ithaca, which is on its own island of the same name.