Whether you went swimming, played five-a-side or spent a day there with your school, it was a huge attraction from the day it opened in 1972.
Join us as we look back to 10 photos from the Hartlepool Mail archives and tell us if they bring back memories for you.
5. Floral in 2022
John and Anne Lancaster were pictured at the Hartlepool Horticultural Show at the Mill House Leisure Centre last year. Photo: Kevin Brady
6. Anyone for short tennis?
Short tennis instructor Ken Caryer was on hand to give some advice to Betty Butcher at the start of a new course at the Mill House Leisure Centre in 1995. Photo: Hartlepool Mail
7. Fab at Footy Tots
So much fun was had by these youngsters during a Footy Tots session in 2017. Photo: Tim Richardson
8. Dancing back to 2009
Performing arts students from Teesside University stepped forward for fun and dancing at the leisure centre 14 years ago. Photo: TC