Roger Brereley (Brearley, Brierley etc.) (1586–1637) was an English clergyman, known as the founder of the Grindletonian sect. His actual views are known from surviving sermons, perhaps reconstituted from notes; those held by the Grindletonians may well have differed considerably from those attributed to them by opponents in polemics. Brereley was in his own view a supporter of Calvinistic orthodoxy, not a sectary, and he censures Jacobus Arminius.
He was born on 4 August 1586, at Marland, then a hamlet in the parish of Rochdale, where Thomas Brereley, his father, and Roger, his grandfather, were farmers. He had three brothers and two sisters younger than himself. Brereley himself began life as a puritan. He took orders and became perpetual curate of Grindleton Chapel, in the parish of Mitton in Craven; Grindleton is about two miles north of Clitheroe. He held (in 1626) a close in Castleton, in the manor of Rochdale, which had belonged to his grandfather. His preaching was simple and spiritual, and his followers soon became distinguished as a group.