The Assembly, which is the supreme authority of the OIE, is composed of Delegates of Member Countries. It meets once a year in the month of May during the General Session.

The Council represents the Assembly during the interval between General Sessions. It meets at least twice a year in Paris to examine technical and administrative matters and, in particular, the working programme and the proposed budget to be presented to the Assembly during the General Session.

In 2019, the Council met from 19 to 21 February and on 23 and 24 May.