| Tirerril | |
| Native Name: | Tír Oirill (Irish) |
| Settlement Type: | Barony |
| Subdivision Type: | Country |
| Subdivision Name: | Ireland |
| Subdivision Type1: | Province |
| Subdivision Name1: | Connacht |
| Subdivision Type2: | County |
| Subdivision Name2: | Sligo |
| Area Land Km2: | 306.8 |
Tirerill (Tír Oirill) is a barony in east County Sligo.[1] It corresponds to the ancient túath of Tir Ollíol.[2]