Henry Manners Cavendish, 3rd Baron Waterpark (8 November 1793 – 31 March 1863), was a British nobleman and Whig politician.
He succeeded his father in the barony in 1830 but as this was an Irish peerage it did not entitle him to an automatic seat in the House of Lords.
The same year he was instead elected to the House of Commons as one of two representatives for Knaresborough, a seat he held until 1832, and then sat for Derbyshire South from 1832 to 1835.
Lady Waterpark, who was a Member of the Royal Order of Victoria and Albert, died in September 1894.
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