加冕，是指将代表权力之冠冕戴上的一种仪式，大多是欧洲君主制的国家才有此俗，一般在君主即位或亲政时加冕，相当于东亚传统的登基仪式。例如英国伊莉沙白二世女王的加冕之登基大典。

在1822年9月7日巴西摄政王佩德罗一世的加冕典礼非常的隆重。

A coronation is a ceremony marking the formal investiture of a monarch and/or their consort with regal power, usually involving the ritual placement of a crown upon his or her head and the presentation of other items of regalia. A ceremony without the placement of a crown on one's head is known as an enthronement. The ceremony may include the taking of special vows by the monarch, acts of homage by the new ruler's subjects and the performance of other ritual deeds of special significance to the particular nation. Once a vital ritual among the world's monarchies, coronations have changed over time for a variety of socio-political and religious factors; most modern monarchies have dispensed with them altogether, preferring simpler enthronement, investiture or benediction ceremonies. Coronations are still observed in the United Kingdom, Tonga, and several Asian countries. In common usage today, coronation normally refers to the official investiture or enthronement of the monarch, whether or not an actual crown is bestowed.