Wilmot Vaughan, 3rd Viscount Lisburne (died 19 January 1766), styled Hon. Wilmot Vaughan until 1762, was a Welsh landowner and Irish peer. He inherited his titles and the Trawsgoed estate in Cardiganshire from his elder brother in 1741, but the estate was heavily financially encumbered, and he had to spend over a decade defending it from the claims of his brother's estranged wife and her son. His marriage to an heiress in some measure recouped the family fortunes.