John Sinnich OFM, (1603-1666) was an Irish-born priest who was professor of theology at the University of Louvain.
He wrote the index to the Augustinus, Cornelius Jansen's posthumously published work, and following the controversy, he tried to argue that Jansenism conformed with the Church's teachings and cleared from censure.
Born in 1603 to Maurice Sinnich and Eleanor Hogan, in County Cork, Ireland, and he was educated at the University of Louvain.
Ordained a priest he also served as canon of the cathedral of Bruges.
[2] He was appointed professor in Louvain in 1637, Dr. Sinnich also held the position of Rector of the college.