| Official Name: | Brđani Kosa |
| Settlement Type: | Village |
| Pushpin Map: | Croatia |
| Pushpin Map Caption: | Location of Brđani Kosa in Croatia |
| Pushpin Label Position: | bottom |
| Coordinates: | 45.3811°N 16.4775°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Continental Croatia (Banovina) |
| Subdivision Type2: | County |
| Subdivision Name2: | Sisak-Moslavina |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Sunja |
| Unit Pref: | Metric |
| Area Footnotes: | [1] |
| Area Total Km2: | 5.7 |
| Elevation M: | 141 |
| 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 |
| Postal Code: | 44211 Blinjski Kut |
| Area Code: | (+385) 44 |
Brđani Kosa is a village in Croatia, in the municipality of Sunja, Sisak-Moslavina County. It is connected by the D224 highway.
According to the 2011 census, the village of Brđani Kosa has 103 inhabitants. This represents 46.19% of its pre-war population according to the 1991 census.
The 1991 census[2] recorded that 85.20% (190/223) of the village population were ethnic Serbs, 5.83% were Yugoslavs (13/223), 3.59% were ethnic Croats (8/223) and 5.38% were of other/unknown ethnic origin (12/223).