| Popilnia | |
| Settlement Type: | Rural settlement |
| Pushpin Map: | Ukraine Zhytomyr Oblast#Ukraine |
| Coordinates: | 49.945°N 29.4597°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Zhytomyr Raion |
| Established Title: | Founded |
| Established Date: | 1870 |
| Unit Pref: | Metric |
| Area Total Km2: | 4 |
| Population Total: | 5323 |
| Population As Of: | 2022 |
| Population Density Km2: | auto |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Postal Code Type: | Postal code |
| Postal Code: | 13500-13503 |
| Area Code Type: | Area code |
Popilnia or Popilnya (uk|Попільня) is a rural settlement in Zhytomyr Raion, Zhytomyr Oblast, Ukraine. It is the administrative center of Popilnia Raion. Population: In 2001, its population was 6,109.
Until 26 January 2024, Popilnia was designated urban-type settlement. On this day, a new law entered into force which abolished this status, and Popilnia became a rural settlement.[1]