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Charles Marsham, 3rd Earl of Romney (30 July 1808 – 3 September 1874), styled Viscount Marsham between 1811 and 1845, was a British peer and Conservative Party politician.

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Romney was the son of Charles Marsham, 2nd Earl of Romney, and Sophia, daughter of William Morton Pitt.

Romney was returned to Parliament as one of two representatives for Kent West in 1841, a seat he held until 1845 when he succeeded his father in the earldom and took his seat in the House of Lords.

Lord Romney married Lady Margaret Harriett Montagu-Scott, youngest daughter of Charles Montagu-Scott, 4th Duke of Buccleuch, on 7 February 1832. They had three sons and one daughter:

• Lady Harriet Marsham (born 17 July 1838, died 14 November 1886)
• Charles Marsham, 4th Earl of Romney (born 7 March 1841, died 21 August 1905)
• The Rev and Hon John Marsham (born 25 July 1842, died 16 September 1926)
• Hon Henry Marsham (born 26 March 1845, died 1 July 1908)

Lady Romney died in London in June 1846, aged 34. Lord Romney remained a widower until his death in September 1874, aged 66. He was succeeded in the earldom by his eldest son, Charles.

• Leigh Rayment's Peerage Pages ^{[self-published source] [better source needed]}
• Leigh Rayment's Historical List of MPs

• Hansard 1803–2005: contributions in Parliament by the Earl of Romney