| Zielonka | |
| Pushpin Map: | Poland |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Masovian |
| Subdivision Type2: | County |
| Subdivision Name2: | Wołomin |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Zielonka (urban gmina) |
| Leader Title: | Mayor |
| Leader Name: | Kamil Michał Iwandowski |
| Established Title3: | Town rights |
| Established Date3: | 1960 |
| Area Total Km2: | 79.23 |
| Population As Of: | 2013[1] |
| Population Total: | 17398 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 52.3008°N 21.1586°W |
| Postal Code Type: | Postal code |
| Postal Code: | 05-220 |
| Area Code: | +48 22 |
| Blank Name: | Car plates |
| Blank Info: | WWL |
| Website: | http://www.zielonka.pl |
Zielonka is a town in Wołomin County, Masovian Voivodeship, Poland, with 17,398 inhabitants (2013). It is located about 13 km to the north-east of the centre of Warsaw.
Zielonka borders Warsaw and several other towns of the Warsaw metropolitan area: Ząbki and Marki in the west, Kobyłka in the north, and Sulejówek in the south. It was granted town rights in 1960.
In August 1920, the Battle of Ossów was fought nearby, as part of the Battle of Warsaw in which the Poles were victorious and repulsed the Soviet invasion. Within the town limits, near the village of Ossów, there is a cemetery of the fallen Polish soldiers with a chapel of Our Lady of Victory.
There are two railway stations in the town (Zielonka and Zielonka Bankowa).