The Commission for the Conservation of Southern Bluefin Tuna (CCSBT) is a Regional fisheries management organisation[1] and international organization with the purpose of managing the stocks of the critically endangered[2] Southern bluefin tuna.

[3] The secretariat is housed in Canberra, Australia.

[4] 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:[5]