Agostino Valier (Augustinus Valerius, or Valerio) was an Italian cardinal and bishop of Verona. He was a reforming bishop, putting into effect the decisions of the Council of Trent by means of administrative and disciplinary measures. He was one of the Christian humanist followers of Filippo Neri.
Valier took part in the intellectual life of his time. In Venice around the year 1560 he was associated with the Academy of Federico Badoer; he later also took part in the Noctes Vaticanae. As a dedicatee of one of the works of Jacopo Zabarella he may have been a patron.
Valier as bishop from 1565 was influenced by his reforming predecessor at Verona, Gian Matteo Giberti, as well as the Council of Trent, and his association with Carlo Borromeo. He followed Borromeo's Milan model but not slavishly, working within local tradition, while also handling the Venetian dominance in a diplomatic fashion. In 1576 he requested that the Jesuits be called to Verona to found a school.
Valier wrote a biography of Carlo Borromeo shortly after his death in 1584, and a history of Venice to 1580. He later became prefect of the Congregation of the Index. The atmosphere of close scrutiny of works is thought to have affected his wish for publication in his own lifetime. One work left unpublished was Philippus sive de laetitia Christiana, referencing Filippo Neri in its title, and dwelling on Carlo Borromeo and his nephew Federigo Borromeo, whom Valier had mentored, in a neostoic vein.
- Rhetorica Ecclesiastica (1570) in Latin, a work based on mission work in the Veneto. This work by Valier employing classical rhetoric as a resource for preaching, with subsequent works by Luis de Granada and Diego de Estella, is considered a significant development in the Catholic tradition. A French translation by Joseph Antoine Toussaint Dinouart, La rhétorique du prédicateur, was published in 1750.
- Instruttione delle donne maritate (1575), a book for wives, in the form of a letter to his married sister.
- De cautione adhibenda in edendis libris (1719).
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- Illustrations of Biblical Literature, vol. II, Rev. James Townley, 1856; archive.org.
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- William James Bouwsma (1968). Venice and the Defense of Republican Liberty: Renaissance Values in the Age of the Counter Reformation. University of California Press. pp. 196–. ISBN 978-0-520-05221-5. Retrieved 29 July 2012.
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- Heidi J. Hornik; Mikeal Carl Parsons (2003). Interpreting Christian Art: Reflections on Christian Art. Mercer University Press. p. 186. ISBN 978-0-86554-850-3. Retrieved 29 July 2012.
- O. C. Edwards (1 September 2010). A History of Preaching. Abingdon Press. p. 337. ISBN 978-1-4267-2562-3. Retrieved 1 August 2012.
- Agostino Valier; Dinouart (1750). La rhétorique du prédicateur. Nyon. Retrieved 29 July 2012.
- Lynda L. Coon; Katherine J. Haldane (1990). That Gentle Strength: Historical Perspectives on Women in Christianity. That Gentle Strength. p. 133 note 30. ISBN 978-0-8139-1293-6. Retrieved 29 July 2012.
- Ethel Ross Barker, Rome of the Pilgrims and Martyrs: a study in the martyrologies, itineraries, syllogæ, and other contemporary documents (1913), p. 130;archive.org.