The National Union of Leather Workers and Allied Trades was a trade union in the United Kingdom representing workers who made items out of leather. The union was founded in 1938 with the merger of six small unions: the London and Provincial Society of Leather Finishers, the London Saddle and Harness Makers' Trade Society, the National Society of Portmanteau, Bag and Fancy Leather Workers, the Union of Saddlers and General Leather Workers, the United Society of Leather Producers and Leather Productions of Great Britain and Ireland, and the Walsall and District Amalgamated Leather Trades Union.