John Mush (alias Ratcliffe) (b. in Yorkshire, 1551 or 1552; d. at Wenge, Buckinghamshire, 1612 or 1613) was an English Roman Catholic priest, the confessor to Margaret Clitherow.
Ordained priest, he returned to England (1583) and laboured at York, being confessor, to Margaret Clitherow who was executed for harbouring him, and Francis Ingleby.
Failing in this, together with John Colleton he set himself to devise some organization of a voluntary character among the clergy which might supply the want of episcopal government much felt after the death of Cardinal William Allen in 1594.
Against the Adversus factiosos in ecclesia circulated by Thomas Lister, Mush wrote Declaratio Motuum (1601) collecting documentation,[1] and in 1602, with Anthony Champney, Bluet and Cecil, went as a deputation to Rome where for eight months they fought for their petition.
Dodd also says he wrote against the apostate priest Thomas Bell, and John Pitts quotes his English translation of Lectiones Panagorali Turini, but these works are not now known to exist.