Evan Lloyd Vaughan (c. 1709–1791) was a Welsh politician who sat in the House of Commons from 1774 to 1791.
Vaughan was the son of Richard Vaughan MP and his wife Margaret Lloyd, daughter of Sir Evan Lloyd of Bodidris, Denbighshire.
He was Constable of Harlech Castle from July 1754 and High Sheriff of Denbighshire in 1766–7.
However he was returned unopposed as Member of Parliament for Merioneth in the by-election on 24 February 1774.
Contemporary parliamentary historian Thomas Oldfield described him in 1816 as “one of the last independent members of the old constitutional school”.