[1] (born Mihovil Šain)[2] (22 November 1869 – 28 January 1932)[3] was a Croatian bishop of the Roman Catholic Church.

Sain was born in Zidine, a hamlet of Dajla, near Novigrad, Croatia, on 22 November 1869,[3] and was ordained on 11 June 1892.

[3] He was born Mihovil, to Croats Antun Šain and Marija Radislović, into a Slavic-speaking family.

This is admitted by Sain himself in a letter to Cardinal Gaetano De Lai, saying that "everyone in the family spoke to him in Slavic, but that he was no longer able to do so in adulthood.

He then became an educator of Benedictine novices, and the dean, secretary, and librarian of the Genoese monastery of St. Giuliano [it].