His Eminence Antonio Tosti
Archivist of the Vatican Secret Archives Librarian of the Vatican Apostolic Library
Portrait - Francesco Coghetti.
Church	Roman Catholic Church
Appointed	13 January 1860
Term ended	20 March 1866
Predecessor	Angelo Mai
Successor	Jean-Baptiste-François Pitra
Other post(s)	Cardinal-Priest of San Pietro in Montorio (1839–66) Protopriest (1863–66)
Previous post(s)	Camerlengo of the College of Cardinals (1859–60)
Orders
Created cardinal	12 February 1838 (in pectore) 18 February 1839 (revealed) by Pope Gregory XVI
Rank	Cardinal-Priest
Personal details
Born	Antonio Tosti 4 October 1776 Rome, Papal States
Died	20 March 1866(1866-03-20) (aged 89) Rome, Papal States
Buried	San Michele a Ripa
Parents	Tommaso Tosti Agnese Massaroti
Alma mater	Collegio Romano

Antonio Tosti (4 October 1776 – 20 March 1866)^[1] was Catholic Cardinal-Priest of San Pietro in Montorio in Rome and later Camerlengo of the Sacred College of Cardinals and Librarian of the Vatican Library.

Tosti was born on 4 October 1776 in Rome, where he died on 20 March 1866.

Little else is known of Tosti's personal life and few official records exist prior to his elevation to Cardinal (in pectore) and appointment as Cardinal-Priest of San Pietro in Montorio on 18 February 1839 where he served until his death.^[2]

In 1859 Tosti was appointed Camerlengo of the Sacred College of Cardinals (not to be confused with the role of Camerlengo of the Holy Roman Church).

Tosti resigned from this post in 1860 upon appointment as the Librarian of the Vatican Library, a title he held until his death in 1866.^[3]

• Catholic Church
• College of Cardinals
• Vatican