(anglicised John O'Cullenan; c. 1583–1661) was an Irish Roman Catholic prelate who served as the Bishop of Raphoe from 1625 to 1661.

Ó Cuileannáin was appointed Vicar Apostolic of the Roman Catholic Diocese of Raphoe by papal brief on 1 December [O.S.

[1][2][3] After having been held in prison in Derry for several years, Bishop Ó Cuileannáin went into exile in March 1653.

[1][4][5] Eóin Ó Cuileannáin died in Brussels on 24 March 1661, aged about 78, and was interred in the chapel of the Virgin in the Cathedral of St. Michael and St.

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