Ecclesia or ekklesia may refer to:
- Ecclesia (Church), the Christian Church
- Ecclesia (ancient Athens), the principal assembly of ancient Athens during its Golden Age
- Ecclesia (sociology of religion), a concept in the typology of religion
- Ekklesia (think tank), a British think tank
- Mount Ecclesia, headquarters of the Rosicrucian Fellowship and location of The Ecclesia, the Rosicrucian Fellowship Temple
- Castlevania: Order of Ecclesia, video game
- Ecclesia Militans, Church Militant, Christians who are living
- Ecclesia Triumphans, Church Triumphant, Christians who are in Heaven