The Citadel Arts Centre, commonly referred to as The Citadel, is an arts and community centre situated in the centre of St Helens in Merseyside, England occupying a Victorian building on the corner of Waterloo Street and Milk Street. The centre opened in 1988 initially as a popular music venue and theatre. After refurbishment in 2000, it continued to offer a large programme of music, theatre and arts based workshops throughout the week. As of 2016, the space is primarily hired by St Helens Council for its adult social care and health activities.