John Robert Flack (born 30 May 1942) is an English Anglican bishop.
Flack was educated at Leeds University and the College of the Resurrection at Mirfield.
From here he rose steadily in the church's hierarchy, being successively Team Rector of Brighouse, Rural Dean of Elland and Archdeacon of Pontefract before his ordination to the episcopate.
[7] On his return to the UK, he was Priest-in-charge of Apethorpe, Nassington, Thornhaugh, Wansford, Woodnewton and Yarwell, in Northamptonshire and Cambridgeshire, until retiring in 2012.
During this time, he also served as an Honorary Assistant Bishop in the Dioceses of Peterborough and of Ely, from which he retired in 2017.