圣体光，也称圣体发光、圣体皓光、圣体光座或圣体显供架，是天主教、旧天主教、圣公宗和信义宗等宗派在一些宗教仪式上面使用的一种祭具，通常为镀金银制品，正中开有一个透明的小窗，用于嵌入圣体，四周呈放射性线条，以表现出“圣体发光”的主题。

A monstrance, also known as an ostensorium (or an ostensory), is the vessel used in Roman Catholic, Old Catholic and Anglican churches for the more convenient exhibition of some object of piety, such as the consecrated Eucharistic host during Eucharistic adoration or Benediction of the Blessed Sacrament. It is also used as reliquary monstrance for the public display of relics of some saints. The word monstrance comes from the Latin word monstrare, while the word ostensorium came from the Latin word ostendere. Both terms, meaning "to show", are used for vessels intended for the exposition of the Blessed Sacrament, but ostensorium has only this meaning.