Henry O'Brien, 5th Earl of Thomond
Henry O'Brien, 5th Earl of Thomond was an Irish peer, styled Lord Ibrickane until 1624.
O'Brien was the son of Donogh O'Brien, 4th Earl of Thomond and Elisabeth FitzGerald. On 13 July 1608 he married Mary Brereton, daughter of William Brereton, 1st Baron Brereton and Margaret Savage, and together they had 5 daughters:
- Lady Margaret O'Brien, who married firstly Edward Somerset, 2nd Marquess of Worcester and secondly Donough Kearney
- Lady Mary O'Brien married, on 24 June 1627, Charles Cokayne, 1st Viscount Cullen
- Lady Elisabeth O'Brien married, on 21 August 1636, Dutton Gerard, 3rd Baron Gerard, grandson of Thomas Gerard, 1st Baron Gerard
- Lady Anne O'Brien married, in 1641, Henry O'Brien, 7th Earl of Thomond
- Lady Honora O'Brien
O'Brien died in 1639, and was succeeded in his peerages by his brother Barnabas O'Brien, 6th Earl of Thomond.
