c.4,500 documents relating to the Earls and Viscounts of Shannon and other members of the Boyle family of Castlemartyr, County Cork, 1687-c.1900. A detailed calendar of this collection is available. The collection includes, for example:
52 letters to Lord Shannon from his wife, Charlotte, mainly concerning their financial difficulties but also commenting on English politics, 1750s-1764.

26 letters from Charlotte, Viscountess Shannon (nee Ponsonby), to her husband, including references to debates in the English House of Commons and Irish and English politics, 1760-1980.

39 letters to Lord Shannon from his sister in law, Charlotte Bolye Walsingham, 1783-1786.

26 letters from Lady Catherine Henrietta Bernard, later Countess of Bandon, to her parents, Lord and Lady Shannon, mostly written in French, 1784-1809.

8 letters from Lady Catherine Henrietta Bernard, later Countess of Bandon, to her brother and sister in law, Lord and Lady Boyle, 1798-1809.

27 letters from Lady Henry Fitzgerald, later Baroness de Ros, to her uncle, Lord Shannon, 1803.

27 letters from Sarah, wife of Lord Boyle, to her husband, c.1797-1801.

22 letters from Catherine, Countess of Shannon, to her son, Lord Boyle, c.1797-1802.

5 letters from Jane Countess Montagu to Sarah, Countess of Shannon, regarding family affairs, 1814-1816.

Papers and related correspondence of Lady Grace Boyle, later Countess of Middlesex, concerning the estate of Shannon Park, County Cork, 1675-1757.

Papers relating to Speaker Boyle's trusteeship of Mrs Anne Coote's estate in County Cork, c.1750-1753.

Verse, particularly by Charlotte Boyle Walsingham, c.1720s-1850s.

Financial papers and related correspondence of 3rd Earl of Shannon's 6 unmarried daughters, 19th century.

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