The Lay Buddhist Ordination refers to the public ordination ceremony wherein a lay follower of Zen Buddhism receives certain Buddhist precepts. The particulars of the ceremony differ widely by country and by school of Buddhism.

Upāsaka (masculine) or Upāsikā (feminine) are from the Sanskrit and Pāli words for "attendant". This is the title of followers of Buddhism who are not monks, nuns, or novice monastics in a Buddhist order, and who undertake certain vows. In modern times they have a connotation of dedicated piety that is best suggested by terms such as "lay devotee" or "devout lay follower".