Ivor H. Gwynne (1867–1934) was a Welsh trade unionist and politician. Born in Briton Ferry, Gwynne worked in the tinplate industry all his life. He joined the Independent Association of Tinplate Makers on its formation in 1886, but it collapsed in 1898. Gwynne was central to the formation of a new union, the Tin and Sheet Millmen's Association, becoming its first president. In 1904, he stood for the full-time general secretaryship of the union. Initial results indicated that he had been narrowly defeated by Henry Davies, but some branches had allowed non-members to vote, and when the election was re-run, Gwynne won.