John Crosbie, alias Sean Mac an Chrosáin, died September 1621, was a bishop of the Church of Ireland.
His elder brother, Patrick Crosbie, had been active in English service since 1588 and helped transplant the septs of Laois into County Kerry.
Sean Mac an Chrosáin became anglicised and converted to Anglicanism.
He held the office of Prebendary of Disert in the diocese of Limerick.
He was appointed the Anglican Bishop of Ardfert and Aghadoe on 15 December 1601.