Grimsby Auditorium is a theatre situated on Cromwell Road, in Grimsby, North East Lincolnshire. With a seated audience capacity of 1,200 the Grimsby Auditorium is the largest professional theatre in Lincolnshire, and one of the larger theatres in the East of England. Built in 1995, it is managed by the venues division of Ambassador Theatre Group on behalf of North East Lincolnshire Council.