List of Famous people with last name Thomond

Murrough O'Brien, 1st Earl of Thomond was the last King of Thomond, and a descendant of the High King of Ireland, Brian Boru.

Thomas de Clare, Lord of Thomond was a Hiberno-Norman peer and soldier. He was the second son of Richard de Clare, 6th Earl of Gloucester and his wife Maud de Lacy, Countess of Gloucester. In 1272 he served a term as Lieutenant of the Duchy of Aquitaine. On 26 January 1276 he was granted the Lordship of Thomond by Edward I of England; he spent the next eight years attempting to conquer it from the O'Brien dynasty, kings of Thomond.

Connor O'Brien, 3rd Earl of Thomond, called Groibleach, grandson of Conor O'Brien ; succeeded to the earldom, 1553; his right to the lordship of Thomond was disputed by his uncle, Donnell; confirmed in his possessions by Thomas Radclyffe, 3rd Earl of Sussex in 1558, who proclaimed his uncles traitors, though peace was not established until 1565. He intrigued with Fitzgerald in 1569, and fled to France; returned to Ireland and received pardon, 1571, with the restoration of his lands, 1573.

Donough O'Brien, 2nd Earl of Thomond, also known as "the fat", was the son of Connor O'Brien, King of Thomond and Annabell Burke. He inherited the earldom from his uncle, Murrough O'Brien, by special remainder.

Juliana FitzMaurice, Lady of Thomond was a Norman-Irish noblewoman, the daughter of Maurice FitzGerald, 3rd Lord of Offaly, and the wife of Thomas de Clare, Lord of Thomond, a powerful Anglo-Norman baron in Ireland, who was a younger brother of Gilbert de Clare, 6th Earl of Hertford. Juliana was married three times; Thomas being her first. She is sometimes referred to as Juliane FitzMaurice.

Henry O'Brien, 5th Earl of Thomond was an Irish peer, styled Lord Ibrickane until 1624.

Donogh O'Brien, 4th Earl of Thomond and Baron of Ibrickan was an Irish nobleman and soldier noted for his loyalty to the Kingdom of Ireland. He fought for the Queen in Tyrone's Rebellion and notably at the Siege of Kinsale. His long-term objective, achieved after decades, was to obtain an official acknowledgment that County Clare, where his possessions were situated, was part of the province of Munster, to free it from the jurisdiction of the Connaught government under which it had been placed.

Henry O'Brien, 7th Earl of Thomond PC (Ire) was an Irish peer, styled Lord Ibrackan from 1639 to 1657.

William O'Brien, 2nd Marquess of Thomond, 6th Earl of Inchiquin KP PC (I) was an Irish peer. He was born in Ennistymon, County Clare, to Capt. Edward Dominic O'Brien and Mary Carrick. He succeeded by special remainder as Marquess of Thomond in 1808 on the death of his uncle Murrough O'Brien, 1st Marquess of Thomond and was appointed a Privy Councillor and Knight of the Order of St Patrick on 11 November 1809. He was created Baron Tadcaster in the British Peerage in 1826.