Crinus Irwin (1771 - 1859) was an Anglican priest in the late eighteenth and early nineteenth centuries, most notably Archdeacon of Ossory from 1822 until his death on 17 December 1859. He was born in Tanrego, County Sligo. He entered Trinity College, Cambridge in 1790 and graduated B.A in 1794. In 1807 he graduated M.A. from Trinity College, Dublin. He was ordained in 1794, and in 1797 was appointed Vicar choral of St Patrick's Cathedral, Dublin. In 1799 he was appointed Prebendary of St Patricks. He was Vicar general of the Diocese of Ferns and Leighlin from 1822 until 1835.