James Howard Harris, 3rd Earl of Malmesbury (25 March, 1807 - 17 May, 1889), was an British statesman of the Victorian era.

The son of the 2nd Earl, he was educated at Eton and Oriel College, Oxford. He spent several years travelling and making acquaintance with famous people; and in 1841 he had only just been elected to the House of Commons as a Conservative, when his father died and he succeeded to the peerage. His political career, though unimpressive, attracted a good deal of contemporary attention, partly owing to his being Foreign Secretary in 1852 and again in 1858—1859 (he was also Lord Privy Seal in 1866—1868 and in 1874—1876), and partly from his influential position as an active Tory of the old school in the House of Lords at a time when Lord Derby and Benjamin Disraeli were, in their different ways, moulding the Conservatism of the period. His long life, and the publication of his Memoirs of an Ex-Minister in 1884, contributed to his reputation. The Memoirs, charmingly written, full of anecdote, and containing much interesting material for the history of the time, remain his chief title to remembrance. Lord Malmesbury also edited his grandfather’s Diaries and Correspondence (1844), and in 1870 published The First Lord Malmesbury and His Friends. He was succeeded as 4th Earl by his nephew, Edward James Harris (1842—1899).

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Clarendon | width="40%" style="text-align: center;" |Foreign Secretary
1858–1859 | width="30%" |Succeeded by:
The Lord John Russell

|- style="text-align: center;" | width="30%" |Preceded by:
The Duke of Argyll | width="40%" style="text-align: center;" |Lord Privy Seal
1866–1868 | width="30%" |Succeeded by:
The Earl of Kimberley

|- style="text-align: center;" | width="30%" |Preceded by:
The Earl of Derby | width="40%" style="text-align: center;" |Leader of the House of Lords
1868 | width="30%" |Succeeded by:
The Earl Granville

|- style="text-align: center;" | width="30%" |Preceded by:
The Viscount Halifax | width="40%" style="text-align: center;" |Lord Privy Seal
1874–1876 | width="30%" |Succeeded by:
The Earl of Beaconsfield