Communion as a way of dialogue, in the context of the 1700 years of the Ecumenical Council of Nicaea (325), aims to analyse how Nicaea can be interpreted as a model for collective conflict resolution, by identifying the principles and dynamics applied in their historical context that may be relevant to contemporary conflict management. Methodologically, a qualitative paradigm is adopted, following the phenomenological hermeneutic method and a descriptive design, through the critical analysis of documents. The results reveal as principles inclusion; open debate; clarity of controversial elements; communion and unity in diversity and consensus. Strategies include the recognition and formulation of conflict; the need to resolve it; dialogue, discernment; logistical support; alternative leadership. In addition, there are values such as humility, commitment, respect for differences and service. It is concluded that communion as a way of dialogue represents an approach based on mutual understanding, empathy and respect for differences, since collaboration was promoted in the search for solutions to theological conflicts by bringing together diverse representatives. Finally, the Council of Nicaea can be interpreted as a useful model for conflict resolution in contexts that require cooperation from various parties with different interests or perspectives.