- primarily genitive singular form, "of the church"
- Advocatus Ecclesiae is the Latin title, in the Middle Ages, of certain lay persons, generally of noble birth, whose duty it was, under given conditions, to represent a particular church or monastery, and to defend its rights against force.
- De triumphis ecclesiae, a Latin epic in elegiac metre, written c. 1250 by Johannes de Garlandia, an English grammarian who taught at the universities of Toulouse and Paris.
- Ex Corde Ecclesiae, an apostolic constitution written by Pope John Paul II regarding Catholic colleges and universities.
- Fasti Ecclesiae Scoticanae, a list of ministers from the Established Church of Scotland.
- Fabrica Ecclesiae, a Roman Catholic Latin term, meaning, etymologically, the construction of a church, but in a broader sense the funds necessary for such construction.
- Lamentatio sanctae matris ecclesiae Constantinopolitanae, a motet by the Renaissance composer Guillaume Dufay.
- Libertas ecclesiae is the notion of emancipation from ecclesiastical authority in relation to the temporal power, which guided the movement of Reform begun in the 11th century.
- Ordinarium Sanctae Romanae Ecclesiae, a document written by Jacobi Gaytani that furthered the development of the papal conclave by establishing a voting procedure currently referred to as "approval voting"
- Regimini militantis Ecclesiae was the papal bull promulgated by Pope Paul III on September 27, 1540, which gave a first approval to the Society of Jesus, also known as the Jesuits, but limited the number of its members to sixty.
- Universalis Ecclesiae, a bull of Pope Pius IX that recreated the Roman Catholic hierarchy in England, which had gone underground with the death of the last Marian bishop in the reign of Elizabeth I
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