| Prague 21 | |
| Native Name: | Praha 21 |
| Settlement Type: | Municipal District of Prague Administrative District of Prague |
| Subdivision Type: | Country |
| Subdivision Name: | Czech Republic |
| Subdivision Type2: | Region |
| Subdivision Name2: | Prague |
| Coordinates: | 50.0758°N 14.6594°W |
| Leader Title: | Mayor |
| Leader Name: | Milan Samec |
| Area Total Km2: | 10.15 |
| Population As Of: | 2021 |
| Population Total: | 10429 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 190 16 |
| Website: | http://www.praha21.cz |
Prague 21, also known as Újezd nad Lesy is municipal district (městská část) in Prague, Czech Republic. It is located in the eastern part of the city. It has 10,429 inhabitants as of 2021.
The administrative district (správní obvod) of the same name consists of municipal district Prague 21, Běchovice, Klánovice and Koloděje.