The ACEEEO exists to promote sound democratic processes and procedures amongst its members and others involved in the electoral process. Governed by the Charter, the Association is structured to employ the resources of its members to conduct effective programs. The ACEEEO has a graduated membership structure with specific membership fees and clear rules for participation.

The ACEEEO membership is open to electoral management bodies (EMBs) as institutions, individual experts and election professionals, and organizations supporting the electoral process. There are four categories of membership.

Institutional Members consist of EMBs from eligible European countries and, as voting members, form the core of the Association. They also benefit from ACEEEO activities and materials at reduced cost or for free. EMBs from other countries may also join as Associate Institutional Members. Interested national and international organisations, non-governmental organisations, and individuals may join as Member-Supporters. Finally, individuals may be granted Honorary Membership for extraordinary service to the Association in support of free and fair elections. While afforded many of the benefits of Institutional Members, Associate Institutional Members, Member-Supporters, and Honorary Members may participate but not vote in the decision making process.