Ecclesiam
- Latin accusative singular form, e.g. "to the church".
- Ecclesiam a Jesu Christo, a Papal constitution promulgated by Pius VII in 1821
- Ecclesiam Suam, an encyclical of Pope Paul VI on the Catholic Church given at St. Peter's, Rome, on the Feast of the Transfiguration, August 6, 1964, the second year of his Pontificate
- Extra Ecclesiam nulla salus, a Latin phrase meaning "Outside the Church there is no salvation"
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