Ralph Weldon (12 April 1674 – 23 November 1713) was an English Benedictine monk and chronicler.
Being converted to the catholic religion by Father Joseph Johnstone, he made his abjuration at St. James's Chapel on 12 October 1687.
He made his profession as a Benedictine monk in the convent of St. Edmund at Paris on 13 January 1691–2.
He was the author of ‘A Chronicle of the English Benedictine Monks from the renewing of their Congregation in the days of Queen Mary to the death of King James II’ [London, 1882], 4to.
The original manuscript, consisting of two folio volumes of ‘Chronological Notes,’ is preserved at Ampleforth, and there is an abridgment of it at St. Gregory's, Downside.