An ordinance or ecclesiastical ordinance is a type of law, legal instrument, or by-law in the canon law of the Catholic Church, the Anglican Communion, and in Calvinism.

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In the Anglican Communion, particularly the American Episcopal Church, ecclesiastical ordinances are the bylaws of a Christian religious organization, especially that of a diocese or province of a church.^{[citation needed]}

In the canon law of the Catholic Church, ecclesiastical ordinances are particular laws, issued in order to fulfil universal law on a local or regional level.^[1][2]

Ecclesiastical Ordinances is the title of the foundation rules, or constitution, of the Reformed Church in Geneva, written by John Calvin in 1541.^[3][4][5] They were revised in 1561.^[6]

• Anglicanism
• Calvinism
• Catholic Church
• Church Order (Lutheran)
• Ecclesiastical court
• Ordinance (Christianity)