Boetius Egan (Irish: Baothnalach Mac Aodhagáin; 1734–1798) was a Roman Catholic Archbishop of Tuam in County Galway, Ireland.

Egan was born near Tuam, Ireland, to a family owning large estates in the County Galway.

Egan attended the College of Bordeaux, there, which had been founded by Irish exiles and endowed by queen Anne in the seventeenth century.

Accustomed during his whole life in Ireland to the barest toleration of his religion, he welcomed the Roman Catholic Relief Act 1793, and hastened to express his gratitude to king George III.

One of his last public acts was to sign an address to the Irish viceroy, Lord Camden, condemning the revolutionary associations then in Ireland.