39 European countries, including all EU and European NATO member states, have the right to send parliamentary delegations to the Assembly. It currently has more than 400 members. Many are members of the defence, foreign or European affairs committees in their own parliaments. The number of delegates depends on the size of the country.

Members of the Assembly comprise parliamentarians of all the EU member states (Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden and the United Kingdom). All members of the delegations from the 27 member states of the European Union are offered the same rights in the Assembly, in particular the right to speak, vote and propose amendments in plenary sessions and committee meetings.

Associates are European members of NATO who are not members of the EU (Albania, Croatia, Iceland, Norway and Turkey).

Partners include other European countries (in particular Armenia, Azerbaijan, Bosnia and Herzegovina, Georgia, Moldova, Montenegro, the Russian Federation, Serbia, the former Yugoslav Republic of Macedonia and Ukraine).

Delegations from other parliaments, the European Parliament or other interparliamentary assemblies may be invited to attend sessions of the Assembly as parliamentary observers.

Political groups: The members of the Assembly, who are either representatives or substitutes, may be affiliated to political groups of which there are currently four: the Federated Group of Christian Democrats and European Democrats, the Socialist Group, the Liberal Group and the EEP/CD.

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