| Ukmergė District Municipality | |
| Native Name: | Ukmergės rajono savivaldybė |
| Native Name Lang: | lt |
| Settlement Type: | Municipality |
| Image Map1: | UkmergesRajonoSeniunijos.png |
| Map Caption1: | Map of municipality |
| Subdivision Type: | Country |
| Subdivision Name: |  Lithuania |
| Subdivision Type1: | Ethnographic region |
| Subdivision Name1: | Aukštaitija |
| Subdivision Type2: | County |
| Subdivision Name2: | Vilnius County |
| Seat Type: | Capital |
| Seat: | Ukmergė |
| Parts Type: | Elderships |
| Unit Pref: | Metric |
| Area Total Km2: | 1395 |
| Population Total: | 34,553 |
| Population As Of: | 2021[1] |
| Population Density Km2: | auto |
| Timezone1: | EET |
| Utc Offset1: | +2 |
| Timezone1 Dst: | EEST |
| Utc Offset1 Dst: | +3 |
| Area Code Type: | Telephone code |
| Blank Name Sec1: | Major settlements |
| Blank Info Sec1: | Ukmergė (pop. 20,154) |
The Ukmergė District Municipality is a municipality in Vilnius County, Lithuania. The capital of the municipality is Ukmergė, the largest settlement and only city in the municipality. The entire municipality belongs to Aukštaitija ethnographic region.
There are 10 towns in Ukmergė municipality: Deltuva, Lyduokiai, Pabaiskas, Siesikai, Šešuoliai, Taujėnai, Vepriai, Vidiškiai, Želva and Žemaitkiemis. Ukmergė municipality shares the second place in Lithuania (with Radviliškis District Municipality) according to the number of towns. There are 612 villages in the municipality, of which 234 are full parishes.
Vepriai is the most populous town in the municipality and is a local tourism (notably rural tourism) center. Siesikai is best known for the 16th century Renaissance Siesikai (Daumantai) Castle near Siesikai Lake. Deltuva has been the centre of the important Deltuva Land at the emergence of the centralised Lithuanian State. The ruins of one of the first Calvinist churches in Lithuania (17th century, Renaissance style) are near Deltuva. Pabaiskas was established near the location where the Battle of Wiłkomierz between the armies led by Žygimantas Kęstutaitis and Švitrigaila took place on 1 September 1435.
The first president of the independent Lithuanian state Antanas Smetona was born in Užulėnis, now Ukmergė District.
The eastern part of the municipality belongs to Aukštaitian Highlands and the north-western part is in Middle Lithuanian Lowlands.
Šventoji River is the largest river in the municipality and Širvinta River is the second. The other rivers are Siesartis, Mūša and Armona. Lake Lėnas is the largest lake (2.65 km²) and Lake Žirnajai is the deepest (average of 9.8 meters).
Woodlands cover about 29 percent of the district, swamps occupy 2.3 percent and 54.5 percent is an arable land.[2]