The Welsh Association of Sub Aqua Clubs (Welsh: Cwmdeithas Clybiau Tanddwr Cymru) (WASAC) is the national governing body (NGB) for Sub Aqua in Wales. Sub Aqua is a broad term encompassing both recreational underwater activities such as recreational diving and snorkelling, and competitive underwater activities including underwater sports as underwater hockey
The WASAC is one of 4 NGBs representing Sub Aqua in the constituent countries of the United Kingdom. The others are the British Sub Aqua Club (England), the Northern Ireland Federation of Sub-Aqua Clubs (Northern Ireland) and the Scottish Sub Aqua Club (Scotland), with the British Sub Aqua Club being the NGB for the United Kingdom; a role it has held since 1954.
Although WASAC is responsible for underwater hockey (also known as Octopush), training and management of Wales national squads is controlled by Hoci Tanddwr Cymreig Underwater Hockey Wales (HTC UHW).
The WASAC is based at Gwaun-Cae-Gurwen, Neath Port Talbot.