Richard Vaughan MP (c. 1655–October 1724) of Derwydd, Carmarthenshire was a Welsh lawyer and Whig politician who sat in the English and British House of Commons for nearly 40 years from 1685 to 1724.
He succeeded his uncle Sir Henry Vaughan, to Derwydd Mansion, near Llandybie in 1676.
[5] He is now reckoned to have been Father of the House from 1718 to his death, although it is not clear that he was regarded as such at the time.
[6] He married, in 1692, Arabella, the daughter of Sir Erasmus Philipps, 3rd Baronet, M.P., of Picton Castle, Pembrokeshire.
They had no children and his estate passed to his niece, the wife of John Vaughan, MP for Carmarthenshire.