The paper explores how the topic of conciliarity/synodality has been addressed in theological dialogues between Eastern Orthodox and Roman Catholics. The work of the official international dialogue commission as well as dialogues at a regional level (North American Orthodox-Catholic Theological Consultation) and unofficial dialogue groups (Saint Irenaeus Joint Orthodox-Catholic Working Group) are examined. The documents reveal broad agreement in the understanding of conciliarity, even if there are differences regarding tasks, responsibilities, and composition of synods. The differences between the theory and practice of conciliarity/synodality, which can be observed in all churches, represent a major challenge for the dialogue.