John Thulis (also spelt Thules, Thewlis) (c. 1568 – 18 March 1616) was an English Roman Catholic priest.
His baptism is recorded in the Whalley Parish Register on 28 December, 1568, the son of William.
He arrived at the English College, Reims, on 25 May 1583, and received tonsure from Cardinal Louis de Guise on 23 September following.
Noted preacher William Leigh, rector of St Wilfrid's Church in Standish, was brought to debate theological points with Thulis;[4] Thulis's godson offered him £20 a year if he would renounce his faith.
A metrical account of his martyrdom, as well as portions of a poem composed by Thulis, were printed by John Hungerford Pollen in his Acts of the English Martyrs (London, 1891), 194–207.