The Commission for the Conservation of Southern Bluefin Tuna (CCSBT) is a Regional fisheries management organisation and international organization with the purpose of managing the stocks of the critically endangered Southern bluefin tuna. The secretariat is housed in Canberra, Australia. CCSBT was established by International treaty signed in Canberra on 10 May 1993 by Australia, Japan, and New Zealand, with the commission commencing a year later. Over the years additional nations have joined.
Members are of three types: members (of the commission), (members of the) extended commission, and co-operation non-members: