The kings of Thomond () ruled from the establishment of Thomond during the High Middle Ages, until the Early modern period. Thomond represented the legacy of Brian Bóruma and the High Kings of Ireland of his line who could not hold onto all of Munster, so had to partition the realm between themselves and Desmond, ruled by their rivals the Eóganachta. The Kings of Thomond were drawn from the leading kindred of the Dál gCais known as the àBriain. For centuries they fought off challenges from the Normans, including the de Clare family and internal conflict between factions. Eventually Murchadh Carrach àBriain decided to surrender and regrant his realm to the Kingdom of Ireland in 1543 and accepted the titles Baron Inchiquin and Earl of Thomond. These titles were recently held by Conor Myles John O'Brien (d.2023)
|- | Conchobhar àBriain<br /> 1118âÂÂ1142<br /> || || Son of Diarmuid àBriain ||unknown || 1142 |- | Toirdhealbhach mac Diarmada Ua Briain<br /> 1142âÂÂ1167<br /> || || Son of Diarmuid àBriain ||unknown || 1167 |- | Muircheartach mac Toirdelbhach àBriain<br /> 1167âÂÂ1168<br /> || || Son of Toirdelbhach mac Diarmaida àBriain ||unknown || 1168 |- | Domhnall Mór àBriain<br /> 1168âÂÂ1194<br /> || || Son of Toirdelbhach mac Diarmaida àBriain ||Orlacan NàMurchada<br>Four children|| 1194 |- | Muircheartach Dall àBriain<br /> 1194âÂÂ1198<br />1203âÂÂ1210<br /> || || Son of Domhnall Mór àBriain and Orlacan NàMurchada||unknown|| 1210 |- | Conchobhar Ruadh àBriain<br /> 1198âÂÂ1203<br /> || || Son of Domhnall Mór àBriain and Orlacan NàMurchada||unknown|| 1203 |- | Donnchadh Cairbreach àBriain<br /> 1210âÂÂ1242<br /> || || Son of Domhnall Mór àBriain and Orlacan NàMurchada||unknown|| 1242 |- | Conchobhar na Suidaine àBriain<br /> 1242âÂÂ1268<br /> || || Son of Donnchadh Cairbreach àBriain||unknown|| 1268 |- | Brian Ruadh àBriain<br /> 1268âÂÂ1276<br>1277<br /> || || Son of Conchobhar na Suidaine àBriain||unknown|| 1277 |-
|- | Toirdhealbhach Mór àBriain<br /> 1276âÂÂ1306<br /> || || Son of Tadhg Cael Uisce àBriain ||unknown || 1306 |- | Donnchadh mac Toirdelbach àBriain<br /> 1306âÂÂ1311<br /> || || Son of Toirdelbach àBriain ||unknown || 1311 |-
|- | Donnchadh mac Brian Ruadh àBriain<br /> 1277âÂÂ1284<br /><small>(claimant)</small><br /> || || Son of Brian Ruadh àBriain ||unknown || 1284 |-
|- | Diarmuid Cléirech àBriain<br /> 1311âÂÂ1313<br />|| || Son of Donnchadh mac Brian Ruadh àBriain ||unknown || 1313 |- | Donnchadh mac Domhnall àBriain<br /> 1313âÂÂ1317<br /> || || Son of Domhnall mac Brian Ruadh àBriain and Mairéad Nic Mathghamhna||unknown || 1317 |-
|- | Muircheartach àBriain<br /> 1317âÂÂ1343<br /> || || Son of Toirdhealbhach Mór àBriain||ÃÂadaoin Nic Gormáin<br>Several children || 1343 |-
|- | Brian Bán àBriain<br /> 1343âÂÂ1350<br /> || || Son of Domhnall mac Brian Ruadh àBriain and Mairéad Nic Mathghamhna||unknown || 1350 |-
|- | Diarmuid mac Toirdelbach àBriain<br /> 1350âÂÂ1360<br /> || || Son of Toirdelbach àBriain||unknown || 1360 |- | Mathghamhain Maonmhaighe àBriain<br /> 1360âÂÂ1369<br /> || || Son of Muircheartach àBriain and ÃÂadaoin Nic Gormáin||ÃÂna NàConchubhair<br>Several children|| 1369 |- | Brian Sreamhach àBriain<br /> 1369âÂÂ1400<br /> || || Son of Mathghamhain Maonmhaighe àBriain and ÃÂna NàConchubhair||Sláine Nic Con Mara<br>Several children || 1400 |- | Toirdelbhach Maol àBriain<br /> 1375âÂÂ1398<br /><small>(claimant)</small> || || Son of Muircheartach àBriain and ÃÂadaoin Nic Gormáin||unknown || 1398 |- | Conchobhar mac Mathghamhna àBriain<br /> 1400âÂÂ1426<br /> || || Son of Mathghamhain Maonmhaighe àBriain and ÃÂna NàConchubhair||unknown || 1426 |- | Tadhg an Glemore àBriain<br /> 1426âÂÂ1438<br /> || || Son of Brian Sreamhach àBriain and Sláine Nic Con Mara||unknown || 1438 |- | Mathghamhain Dall àBriain<br /> 1438âÂÂ1444<br /> || || Son of Brian Sreamhach àBriain and Sláine Nic Con Mara||unknown || 1444 |- | Toirdhealbhach Bóg àBriain<br /> 1444âÂÂ1459<br /> || || Son of Brian Sreamhach àBriain and Sláine Nic Con Mara||Catherine Burke<br>Several children || 1459 |- | Tadhg an Chomhaid àBriain<br /> 1459âÂÂ1466<br /> || || Son of Toirdhealbhach Bóg àBriain and Catherine Burke||Annabella Burke<br>Several children || 1466 |- | Donnchadh mac Mathghamhna àBriain<br /> 1459âÂÂ1461<br /><small>(claimant)</small> || || Son of Mathghamhain Dall àBriain||unknown || 1461 |- | Conchobhar na Srona àBriain<br /> 1466âÂÂ1496<br /> || || Son of Toirdhealbhach Bóg àBriain||unknown || 1496 |- | Toirdelbhach ÃÂg àBriain<br /> 1496âÂÂ1498<br /> || || Son of Toirdhealbhach Bóg àBriain and Catherine Burke||unknown || 1498 |- | Toirdhealbhach Donn àBriain<br /> 1498âÂÂ1528<br /> || || Son of Tadhg an Chomhaid àBriain and Annabella Burke||Raghnailt Nic Con Mara<br>Several children<br><br>Joan FitzMaurice<br>Several children || 1528 |- | Conchobhar mac Toirdhealbaig àBriain<br /> 1528âÂÂ1539<br /> || || Son of Toirdelbhach Donn àBriain and Raghnailt Mac Con Mara||unknown || 1539 |- | Murchadh Carrach àBriain<br /> 1539âÂÂ1543<br /> || || Son of Toirdelbhach Donn àBriain and Raghnait MacNamara||Eleanor FitzGerald || 1551 |-