Agostinho Barbosa (Agostino, Augustinus) (17 September 1589, at Aldão, Guimarães, Portugal – 22 March 1649, in Ugento, Italy) was a prolific Portuguese writer on canon law. His work included dictionary-type surveys of the legal elements.
Having studied canon law in Portugal, he went to Rome. Being without books, he memorized books in libraries. About 1632 he went to Madrid, where he applied himself to writing and fulfilled various duties confided to him till 1648. consecrated Bishop of Ugento in Rome, on 22 March 1649.
His works fill at least 30 volumes. They show intimate acquaintance with authors, sources, and controversial questions such as the following:
- "Pastoralis Sollicitudinis, sive de Officio et Potestate Episcopi Tripartita Descriptio" (Rome, 1621; Lyons, 1629; in folio, 1641, 1650, etc.).
- "Variae Juris Tractationes", a similar work relating to parish priests was published in Rome in 1632, Lyons, 1634, Geneva, 1662, Venice, 1705, in quarto; in folio, Lyons, 1631 and 1644, Strasburg, 1652.
- "Juris Ecclesiastici Universi Libri III" (Lyons, 1633, 1645, 1718).
All the canonical works of Barbosa were published at Lyons, 1657–75, in 19 vols. In quinto, 16 vols. in folio, and again, 1698–1716, 20 vols. in quinto, 18 vols. in folio.
- Hurter in Kirchenlexikon, s. v.
- Franz Xavier Wernz, Jus Decretalium (Rome, 1898), I, 408.
- António Manuel Hespanha, Form and content in early modern legal books: Bridging material bibliography with history of legal thought (PDF, p. 20), = Portuguese Journal of Social Science, Volume 6, Issue 1, August 2007, pp. 33-59. Archived August 12, 2007, at the Wayback Machine.
- Constant van de Wiel, History of Canon Law (1991), p. 160.
- Codex Iuris Canonici