Francesco Nelli ( Florence – Naples, 1363) was the secretary of bishop Angelo Acciaioli I and a pastor at the Prior of the Church of the Holy Apostles in Florence. He corresponded with Petrarch, sending fifty surviving letters to him and receiving thirty-eight. Six of the nineteen letters of Petrarch's Liber sine nomine are addressed to Nelli.

• Liber Sine Nomine in Latin with letters # 6, #, 9, # 10, # 17, # 18, and # 19 to the priest Francesco Nelli of Florence
• Petrarch (1973). Norman P. Zacour (tr.). Petrarch's Book Without A Name. ISBN  978-0-88844-260-4. (Page 60)
• Petrarch letters in JSTOR Modern Language Notes, Volume LXV May, 1950 Number 5 (ref: Francesco Nelli of Florence).
• JSTOR Petrarch's Laelius, Chaucer's Lollius by Lillian Herlands Hornstein PMLA, Vol. 63, No. 1 (Mar., 1948), pp. 64-84
• University of Florida, Department of Romance Languages and Literatures ITT 3530 special topics
• "Petrach, Francesco (1304-1374)", Biography describes Petrarch becoming friends with Francesco Nelli, Ildebrandino Conti, Giovanni Boccaccio, Lapo da Castiglionchio, and Zanobi da Strada.