| Official Name: | Katnajur |
| Native Name: | Կաթնաջուր |
| Pushpin Map: | Armenia |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Name: | Armenia |
| Subdivision Type1: | Marz (Province) |
| Subdivision Name1: | Lori Province |
| Population As Of: | 2008 |
| Population Total: | 1821 |
| Timezone: | |
| Utc Offset: | +4 |
| Timezone Dst: | |
| Utc Offset Dst: | +5 |
| Coordinates: | 40.825°N 44.1414°W |
| Elevation M: | 1720 |
Katnajur (Armenian: Կաթնաջուր, also romanized as Kat’najur and Katnadzhur; formerly, Karal) is a town in the Lori Province of Armenia.