| Royal Title: | Kings |
| Realm: | Thomond |
| Native Name: | Rí Tuamhain |
| Coatofarms: | Kingdom of Thomond.png |
| Coatofarmssize: | 250px |
| Coatofarmscaption: | Map of Thomond, c. 11th century. |
| First Monarch: | Conchobhar Ó Briain |
| Last Monarch: | Murchadh Carrach Ó Briain |
| Style: | Rí Tuamhain |
| Residence: | Clonroad |
| Appointer: | Tanistry |
| Began: | 1118 |
| Ended: | 1543 |
The kings of Thomond (Irish: ''' Rí Tuamhain''')[1] [2] 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 Ó Briain. For centuries they fought off challenges from the Normans, including the de Clare family and internal conflict between factions. Eventually Murchadh Carrach Ó Briain 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 Ó Briain
1118–1142
|| || Son of Diarmuid Ó Briain ||unknown || 1142|-| Toirdhealbhach mac Diarmada Ua Briain
1142–1167
|| || Son of Diarmuid Ó Briain ||unknown || 1167|-| Muircheartach mac Toirdelbhach Ó Briain
1167–1168
|| || Son of Toirdelbhach mac Diarmaida Ó Briain ||unknown || 1168|-| Domhnall Mór Ó Briain[3]
1168–1194
|| || Son of Toirdelbhach mac Diarmaida Ó Briain ||Orlacan Ní Murchada
Four children|| 1194|-| Muircheartach Dall Ó Briain
1194–1198
1203–1210
|| || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1210|-| Conchobhar Ruadh Ó Briain
1198–1203
|| || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1203|-| Donnchadh Cairbreach Ó Briain
1210–1242
|| || Son of Domhnall Mór Ó Briain and Orlacan Ní Murchada||unknown|| 1242|-| Conchobhar na Suidaine Ó Briain
1242–1268
|| || Son of Donnchadh Cairbreach Ó Briain||unknown|| 1268|-| Brian Ruadh Ó Briain
1268–1276
1277
|| || Son of Conchobhar na Suidaine Ó Briain||unknown|| 1277|-|}
|-| Toirdhealbhach Mór Ó Briain
1276–1306
|| || Son of Tadhg Cael Uisce Ó Briain ||unknown || 1306|-| Donnchadh mac Toirdelbach Ó Briain
1306–1311
|| || Son of Toirdelbach Ó Briain ||unknown || 1311|-|}
|-| Donnchadh mac Brian Ruadh Ó Briain
1277–1284
(claimant)
|| || Son of Brian Ruadh Ó Briain ||unknown || 1284|-|}
|-| Diarmuid Cléirech Ó Briain
1311–1313
|| || Son of Donnchadh mac Brian Ruadh Ó Briain ||unknown || 1313|-| Donnchadh mac Domhnall Ó Briain
1313–1317
|| || Son of Domhnall mac Brian Ruadh Ó Briain and Mairéad Nic Mathghamhna||unknown || 1317|-|}
|-| Muircheartach Ó Briain
1317–1343
|| || Son of Toirdhealbhach Mór Ó Briain||Éadaoin Nic Gormáin
Several children || 1343|-|}
|-| Brian Bán Ó Briain
1343–1350
|| || Son of Domhnall mac Brian Ruadh Ó Briain and Mairéad Nic Mathghamhna||unknown || 1350|-|}
|-| Diarmuid mac Toirdelbach Ó Briain
1350–1360
|| || Son of Toirdelbach Ó Briain||unknown || 1360|-| Mathghamhain Maonmhaighe Ó Briain
1360–1369
|| || Son of Muircheartach Ó Briain and Éadaoin Nic Gormáin||Úna Ní Conchubhair
Several children|| 1369|-| Brian Sreamhach Ó Briain
1369–1400
|| || Son of Mathghamhain Maonmhaighe Ó Briain and Úna Ní Conchubhair||Sláine Nic Con Mara
Several children || 1400|-| Toirdelbhach Maol Ó Briain
1375–1398
(claimant) || || Son of Muircheartach Ó Briain and Éadaoin Nic Gormáin||unknown || 1398|-| Conchobhar mac Mathghamhna Ó Briain
1400–1426
|| || Son of Mathghamhain Maonmhaighe Ó Briain and Úna Ní Conchubhair||unknown || 1426|-| Tadhg an Glemore Ó Briain
1426–1438
|| || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||unknown || 1438|-| Mathghamhain Dall Ó Briain
1438–1444
|| || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||unknown || 1444|-| Toirdhealbhach Bóg Ó Briain
1444–1459
|| || Son of Brian Sreamhach Ó Briain and Sláine Nic Con Mara||Catherine Burke
Several children || 1459|-| Tadhg an Chomhaid Ó Briain
1459–1466
|| || Son of Toirdhealbhach Bóg Ó Briain and Catherine Burke||Annabella Burke
Several children || 1466|-| Donnchadh mac Mathghamhna Ó Briain
1459–1461
(claimant) || || Son of Mathghamhain Dall Ó Briain||unknown || 1461|-| Conchobhar na Srona Ó Briain
1466–1496
|| || Son of Toirdhealbhach Bóg Ó Briain||unknown || 1496|-| Toirdelbhach Óg Ó Briain
1496–1498
|| || Son of Toirdhealbhach Bóg Ó Briain and Catherine Burke||unknown || 1498|-| Toirdhealbhach Donn Ó Briain
1498–1528
|| || Son of Tadhg an Chomhaid Ó Briain and Annabella Burke||Raghnailt Nic Con Mara
Several children
Joan FitzMaurice
Several children || 1528|-| Conchobhar mac Toirdhealbaig Ó Briain
1528–1539
|| || Son of Toirdelbhach Donn Ó Briain and Raghnailt Mac Con Mara||unknown || 1539|-| Murchadh Carrach Ó Briain
1539–1543
|| || Son of Toirdelbhach Donn Ó Briain and Raghnait MacNamara||Eleanor FitzGerald || 1551|-|}