Donn Cuailnge
| Statue of Donn Cuailnge on the Cooley Peninsula | |
| Creature information | |
|---|---|
| Other name(s) | The Brown Bull of Cooley | 
| Grouping | Irish mythology | 
| Sub grouping | Mythical bull | 
| Origin | |
| Country | Ireland | 
In the Ulster Cycle of Irish mythology Donn Cúailnge, the Brown Bull of Cooley, was an extremely fertile stud bull over whom the Táin Bó Cúailnge (Cattle Raid of Cooley) was fought.