John Browne, 1st Marquess of Sligo

John Denis Browne, 1st Marquess of Sligo KP PC (Ire) (11 June 1756 – 2 January 1809) was an Irish peer and politician, and was the son of Peter Browne, 2nd Earl of Altamont, and his wife Elizabeth, née Kelly, daughter of Denis Kelly, Chief Justice of Jamaica.

Browne was styled Viscount Westport from 1771 to 1780 and known as John Browne, 3rd Earl of Altamont from 1780 to 1800. Browne represented Jamestown in the Irish House of Commons from 1776 to 1780, when he succeeded as Earl of Altamont. He served as High Sheriff of Mayo for 1779. He became Marquess of Sligo on 29 December 1800 and was appointed a Knight of the Order of St Patrick on 5 August 1800.

He was married to Lady Louisa Catherine Howe. After their marriage, she was known as the Countess of Altamont and then the Marchioness of Sligo.

His great-grandnephew was the British composer and poet, William Charles Denis Browne (1888–1915).

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