John Netterville, 2nd Viscount Netterville (c.1603-1659) was an Irish peer, soldier and statesman of the seventeenth century. He was noted for his devout Roman Catholic beliefs and his strong support for the Irish Catholic political cause; this led him during the Irish Rebellion of 1641 and the ensuing Civil Wars to play a double game, offering support to both the Crown and the rebels, with the result that no party to the conflict fully trusted him. He was charged with treason by the Government of Charles I and his estates were forfeited by Oliver Cromwell. He died in his English exile of natural causes.