Saint Nicholas Church is a Church of England Parish Church in Stevenage, Hertfordshire.The parish boundaries extend around the northern edge of Stevenage, incorporating areas of the Old and New towns, including a section of Great Ashby. The church is a Grade 1 listed building and is composed of an Entrance Porch, Nave, North and South Aisles, Choir, Lady Chapel, Trinity Chapel and Vestry. Both the Lady Chapel and Trinity Chapel were endowed.