| Joniškis District Municipality | |
| Native Name: | Joniškio rajono savivaldybė |
| Native Name Lang: | lt |
| Settlement Type: | District Municipality |
| Image Map1: | JoniskioRajonoSeniunija.png |
| Map Caption1: | Location of Joniškis |
| Coordinates: | 56.2411°N 23.6153°W |
| Parts Style: | para |
| Subdivision Type: | Country |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | Region |
| Subdivision Name1: | Aukštaitija |
| Subdivision Type2: | County |
| Subdivision Name2: | Šiauliai County |
| Established Title: | Established |
| Seat Type: | Capital |
| Seat: | Joniškis |
| Parts Type: | Elderships |
| P1: | 10 |
| Government Type: | City Council |
| Governing Body: | Joniškis District Council |
| Leader Title: | Mayor |
| Leader Name: | Vitalijus Gailius (LRLS) |
| Leader Title1: | Leading |
| Leader Name1: | Liberal Movement[1] |
| Unit Pref: | Metric |
| Area Rank: | 34th |
| Area Total Km2: | 1151 |
| Elevation M: | 95 |
| Population As Of: | 2022[2] |
| Population Total: | 20708 |
| Population Rank: | 41st |
| Population Density Km2: | 17.99 |
| Population Density Rank: | 41st |
| Timezone1: | EET |
| Utc Offset1: | +2 |
| Timezone1 Dst: | EEST |
| Utc Offset1 Dst: | +3 |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 84001–84446 |
| Area Code Type: | Phone code |
| Area Code: | +370 (426) |
Joniškis District Municipality (Joniškio rajono savivaldybė) is a territorial unit of Lithuania with a population of about 30,000. The administrative center of the municipality is the city of Joniškis.
Joniškis District Municipality is divided into 10 elderships:[3]
| Eldership (Administrative Center) | Area | Population (2021) | |
|---|---|---|---|
| Gaižaičiai (Gaižaičiai) | 108km2 | 352 | |
| Gataučiai (Gataučiai) | 105km2 | 1,261 | |
| Joniškis (Joniškis) | 106km2 | 10,011 | |
| Kepaliai (Kirnaičiai) | 87.7km2 | 1,416 | |
| Kriukai (Kriukai) | 134km2 | 1,088 | |
| Rudiškiai (Rudiškiai) | 59.9km2 | 583 | |
| Satkūnai (Satkūnai) | 100km2 | 1,043 | |
| Saugėlaukis (Bariūnai) | 70.6km2 | 1,104 | |
| Skaistgirys (Skaistgirys) | 136km2 | 1,901 | |
| Žagarė (Žagarė) | 181km2 | 2,525 |