Thomas Lascelles Isa Shandon Valiant Iremonger (14 March 1916 - 13 May 1998) was a British Conservative Party politician.
Iremonger was educated at King's College, Canterbury and Oriel College, Oxford, where he gained a sailing blue, then worked as a district officer in the Colonial Administrative Service in the Western Pacific. He served with the RNVR during World War II, seeing war service at sea. In 1942 he joined the New Zealand Navy and was commissioned the following year. He was an editor, author, journalist and Lloyd's of London underwriter, and worked as a public relations officer and for Conservative Central Office. A barrister, he was called to the Bar by Inner Temple. He served as a councillor on Chelsea Borough Council 1953.
Iremonger contested Birmingham Northfield in 1950. He was elected Member of Parliament for Ilford North at a 1954 by-election, and served until 1974 when he was defeated by Labour's Millie Miller in the October election of that year. In 1978 he stood in the by-election following Miller's death as 'Conservative Independent Democrat', coming fifth.
Iremonger was a cousin of Anthony Eden. His wife Lucille Iremonger was a successful writer and broadcaster.