| Viljandi Parish | |
| Native Name: | Viljandi vald |
| Settlement Type: | Municipality of Estonia |
| Flag Size: | 160 |
| Subdivision Type: | Country |
| Subdivision Name: | Estonia |
| Subdivision Type1: | County |
| Subdivision Name1: | Viljandi County |
| Seat Type: | Administrative centre |
| Seat: | Viljandi |
| Leader Party: | IRL |
| Leader Title: | Mayor |
| Leader Name: | Alar Karu |
| Area Total Km2: | 651 |
| Population Total: | 13569[1] |
| Population As Of: | 2019 |
| Population Density Km2: | auto |
| Iso Code: | EE-899 |
Viljandi Parish (et|Viljandi vald) is a rural municipality of Viljandi County, Estonia. It is located around the town of Viljandi, but does not include it.
Viljandi Parish was established by merging four municipalities: Paistu, Pärsti, Saarepeedi and Viiratsi parishes. This took place after the municipal elections held on 20 October 2013.[2]
Between 1939 and 1950, Viljandi Parish existed with different borders.
Viljandi Parish has 4 small boroughs (alevik): Kolga-Jaani, Mustla, Ramsi and Viiratsi and approximately 126 villages, including: