| Official Name: | Donja Reka |
| Settlement Type: | Settlement |
| Pushpin Map: | Croatia |
| Subdivision Type: | Country |
| Subdivision Name: |  Croatia |
| Subdivision Type1: | County |
| Subdivision Name1: | Zagreb |
| Subdivision Type2: | Town |
| Subdivision Name2: | Jastrebarsko |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.0 |
| Population As Of: | 2021 |
| Population Total: | 327 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
Donja Reka is a settlement in the Jastrebarsko administrative area of Zagreb County, Croatia. As of 2011 it had a population of 349.