John Thomas Atkinson Glass (8 September 1936 – 24 February 2004), often known as Pastor Jack Glass or simply as Jack Glass, was a Scottish Protestant preacher, evangelist and political activist. Glass is most readily associated with his strong views on unionism in Northern Ireland, his anti-Catholic speeches and his association with his friend and colleague Ian Paisley. According to his obituary in The Times, Glass was seen as Scotland's answer to Ian Paisley.