Saint Nicholas' Church is a Church of England parish church in Stevenage, Hertfordshire. It occupies a hilltop site above Old Stevenage. 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 I 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.