(2 February 1518 – 28 July 1587) was a Dominican friar who served as the Bishop of Haarlem and the last direct Abbot of Egmond Abbey from 1570 to 1578.

Van Mierlo was born in the City of Helmond on 2 February 1518, then the Duchy of Brabant, part of the Habsburg Netherlands.

[1] The following year, however, on December 4, 1572, the cathedral suffered the iconoclastic destruction of the Beeldenstorm and temporarily became the scene of Calvinist services, which lasted until the end of the Siege of Haarlem.

[3] The provost of the cathedral, Jacobus Zaffius, who had witnessed the Amsterdam "Alteratie" two days earlier, saw it happen.

Van Mierlo fled to Rome where Pope Gregory XIII appointed him coadjutor bishop of the Diocese of Münster.