Oratio Imperata (Latin: Obligatory Prayer) is a set of Roman Catholic invocative prayers consisting of a liturgical action and a short, general prayer which the local ordinary or prelate of the church may publicly pray when a grave need or calamity occurs.
Common reasons for the religious invocation of the prayer are natural calamities such as storms, snow and drought while rare circumstances which merit the prayer are wars, plague and the disruption of public peace in society. The prayers are customarily invoked by an Archdiocese on behalf of overwhelming popular requests, and is authorised by a high-ranking prelate or Metropolitan Archbishop.
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