Mary O'Brien, 3rd Countess of Orkney (c. 1721–1791) was the eldest daughter of Anne O'Brien, 2nd Countess of Orkney and William O'Brien, 4th Earl of Inchiquin, and Countess of Orkney in her own right. She was deaf and dumb and was married by signs, in 1753, to her first cousin, Murrough O'Brien, fifth Earl of Inchiquin, first Marquess of Thomond, and first Baron Thomond, of Taplow, in England, K.P. She lived with her husband at his seat, Rostellan, on the harbor of Cork.

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  • Mary O'Brien, 3rd Countess of Orkney (c. 1721–1791) was the eldest daughter of Anne O'Brien, 2nd Countess of Orkney and William O'Brien, 4th Earl of Inchiquin, and Countess of Orkney in her own right. She was deaf and dumb and was married by signs, in 1753, to her first cousin, Murrough O'Brien, fifth Earl of Inchiquin, first Marquess of Thomond, and first Baron Thomond, of Taplow, in England, K.P. She lived with her husband at his seat, Rostellan, on the harbor of Cork. She succeeded to the Earldom on the 5th of December, 1766, when her mother died without male issue. By his Lordship, she had an only surviving daughter, Mary, the fourth Countess. The Marquess of Thomond died in consequence of his horse falling with him in Grosvenor Square, on the 10th of February, 1808, in the 85th year of his age. The Countess of Orkney died on the 10th of May, 1790.
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  • 1756-1791
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  • Mary O'Brien, 3rd Countess of Orkney (c. 1721–1791) was the eldest daughter of Anne O'Brien, 2nd Countess of Orkney and William O'Brien, 4th Earl of Inchiquin, and Countess of Orkney in her own right. She was deaf and dumb and was married by signs, in 1753, to her first cousin, Murrough O'Brien, fifth Earl of Inchiquin, first Marquess of Thomond, and first Baron Thomond, of Taplow, in England, K.P. She lived with her husband at his seat, Rostellan, on the harbor of Cork.
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  • Mary O'Brien, 3rd Countess of Orkney
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