| La Jacetania | |
| Native Name Lang: | es |
| Settlement Type: | Comarca |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Huesca & Zaragoza |
| Seat Type: | Capital |
| Seat: | Jaca |
| Parts Type: | Municipalities |
| Parts Style: | list |
| Area Total Km2: | 1857.9 |
| Population Total: | 18664 |
| Population Density Km2: | auto |
| Blank Name Sec1: | Largest municipality |
| Blank Info Sec1: | Jaca |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Area Code Type: | Dialing code |
La Jacetania (Aragonese: A Chacetania; French: Jacétanie) is a comarca in northern Aragon, Spain. It is located in the northwestern corner of the Huesca and Zaragoza provinces.The administrative capital is Jaca, with 13,374 inhabitants the largest town of the comarca. The area is famous for its ski resorts.
Jacetania borders with France in the north and with Navarre in the west. Most of its territory is mountainous, with the ranges of the Pyrenees and Pre-Pyrenees covering most of its area. The name of the comarca originates in the ancient Iberian tribe of the Iacetani (Latin: Iaccetani).
This comarca was the birthplace of the historic County of Aragon.
The traditional names of the towns, when different from the official name, are in brackets.