(c. 1771–1847) was an Irish Dominican friar who served in the Roman Catholic Church as the Bishop of Killala from 1835 until 1847.

O'Finan was elected Bishop of the Diocese of Killala by the Propaganda Fide on 26 January 1835, which was approved by Pope Gregory XVI on 1 February 1835.

His papal brief was issued on 13 February 1835 and consecrated by Cardinal Giacomo Filippo Fransoni on 21 March 1835.

However, O'Finan faced strong local opposition from supporters of the previous bishop, John MacHale.

The following year, Tommaso Feeny was appointed Papal Administrator of Killala on 18 July 1839.