Francis Harold (died 18 March 1685), was an Irish Franciscan in the Order of Friars Minor and a historical writer.
In 1662, while in Rome, Harold published an epitome of the "Annals" of his uncle, Friar Luke Wadding, in two folio volumes, extending from 1208 to 1540, to which he prefixed a life of Wadding, dedicating it to Cardinal Francesco Barberini.
He also wrote Beati Thuribii Alphonsi Mogroveii archiepiscopi Limensis vita exemplaris, published in Rome in 1683.
A copy of this work with the author's manuscript corrections is still preserved in the library of the Royal Irish Academy.
notis et scholiis illustrata, published in Rome in 1673, contains a collection of documents connected with the synods and other affairs of importance to the Catholic Church in Peru.