Tirerril

{{Use dmy dates|date=October 2020}}

{{Use Irish English|date=October 2020}}

{{Infobox settlement

| name = Tirerril

| native_name = Tír Oirill (Irish)

| settlement_type = Barony

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| image_map = Barony of Tirerril, Co. Sligo.png

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| subdivision_type = Country

| subdivision_name = Ireland

| subdivision_type1 = Province

| subdivision_name1 = Connacht

| subdivision_type2 = County

| subdivision_name2 = Sligo

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| area_land_km2 = 306.8

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Tirerill (Tír Oirill) is a barony in east County Sligo.{{cite web|url=http://allismotion.webs.com/cairbredrumcliabh.htm |title=Sligo History Project - Cairbre Drumcliabh |publisher=Allismotion.webs.com |date= |accessdate=2014-04-26}} It corresponds to the ancient túath of Tir Ollíol.{{cite web|url=http://allismotion.webs.com/tirolliol.htm |title=Sligo History Project - Tir Olliol |publisher=Allismotion.webs.com |date= |accessdate=2014-04-26}}