Wales Millennium Centre (Welsh: Canolfan Mileniwm Cymru) is an arts centre located in the Cardiff Bay area of Cardiff, Wales. The site covers a total area of 4.7 acres (1.9 ha). Phase 1 of the building was opened during the weekend of the 26–28 November 2004 and phase 2 opened on 22 January 2009 with an inaugural concert. The centre has hosted performances of opera, ballet, dance, comedy and musicals.
Locally nicknamed "the Armadillo", the Centre comprises one large theatre and two smaller halls with shops, bars and restaurants. It houses the national orchestra and opera, dance, theatre and literature companies, a total of eight arts organisations in residence. The main theatre, the Donald Gordon Theatre, has 1,897 seats, the BBC Hoddinott Hall 350 and the Weston Studio Theatre 250.
In 2001 Lord Rowe-Beddoe was appointed chairman of Wales Millennium Centre, a company limited by guarantee. Board members include Sir Michael Checkland.