A novice is a person who has entered a religious order and is under probation, before taking vows. A novice can also refer to a person (or animal e.g. racehorse) who is entering a profession with no prior experience. A novice is often referred to as an apprentice who is learning a trade or early long term career. A Novice is a step in a ladder, if you are skilled, you progress forward.

In many Buddhist orders, a man or woman who intends to take ordination must first become a novice, adopting part of the monastic code indicated in the vinaya and studying in preparation for full ordination. The name for this level of ordination varies from one tradition to another. In Pali, the word is samanera, which means 'small monk' or 'boy monk'.^{[citation needed]}

A novice in Catholic canon law and tradition is a prospective member of a religious order who is being tried and assessed for suitability of admission to a religious order of priests, religious brothers, or religious sisters, whether the community is one of monks or has an apostolate. After initial contact with the community, and usually a period of time as a postulant (a period of candidacy in which the aspirant lives with the community), the person will be received as a novice in a ceremony that most often involves being clothed with the religious habit (traditional garb) of the particular religious community. The novice's habit is often slightly different from those of professed members of the order. For instance, in communities of women that wear a black veil, novices often wear a white one, sometimes, for example among the Trappists, also a white scapular instead of the black of the professed; among Franciscan communities of men, novices wear an additional shirt-like chest piece over the traditional Franciscan robe; Carthusian novices wear a dark cloak over the usual white habit; etc.

Novices are not admitted to vows until they have successfully completed the prescribed period of training and proving, called the novitiate. This usually lasts at least one year, the minimum required by Canon Law, though in some orders and communities it is two. Novices typically have cells or a dormitory in separate areas within a monastery or community and are under the direct supervision of a novice master or novice mistress.

In communities belonging to the Evangelical-Lutheran Churches, the period of the novitiate starts after postulancy. The period of postulancy depends on the specific Evangelical-Lutheran monastery or convent. For example, for the Sisters of St. Francis at Klaradals Convent, the time spent as a novice is typically two to three years. In the Order of Lutheran Franciscans, this period lasts for a minimum of five years.

In Anglicanism, the novitiate is the period of time where a novice is trained as a member of the religious order or monastery.

In the Eastern Orthodox Church, a candidate may be clothed as a novice (Slavonic: послушник, poslushnik, literally "one under obedience") by the hegumen (abbot) or hegumenia (abbess) after at least three days in the monastery. There is no formal ceremony for the clothing of a novice; he or she is simply given the riassa, belt and skoufos. Novice nuns additionally wear a veil (apostolnik) that covers the head and neck. A novice is also given a prayer rope and instructed in the use of the Jesus Prayer. In large communities, the new novice may be assigned a starets (spiritual father or spiritual mother) who will guide his (or her) spiritual development. Frequent confession of sins and participation in the sacred mysteries (sacraments) of the church is an important part of Orthodox monastic life.

A novice is free to leave the monastery at any time, and the superior is free to dismiss the novice at any time if, for instance, they feel that the novice is not called to monasticism or if there have been issues of discipline. If, however, the novice perseveres, after a period of around three years, the hegumen may choose to clothe them in the first (beginning) rank of monasticism: the rassaphore.