| Official Name: | Kosa Janjačka |
| Pushpin Map: | Croatia |
| Pushpin Label Position: | bottom |
| Coordinates: | 44.7101°N 15.4345°W |
| Subdivision Type: | Country |
| Subdivision Type1: | County |
| Subdivision Name1: | Lika-Senj |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Perušić |
| Area Footnotes: | [1] |
| Area Total Km2: | 60.6 |
| Population As Of: | 2021 |
| Population Total: | 69 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
Kosa Janjačka is a village in Perušić, Croatia. The population as of 2011 is 98.