William III and II in the context of Mary, Princess Royal and Princess of Orange

The Nonjuring schism refers to a split in the established churches of England, Scotland and Ireland, following the deposition and exile of James II and VII in the 1688 Glorious Revolution. As a condition of office, clergy were required to swear allegiance to the ruling monarch; for various reasons, some refused to take the oath to his successors, William III and II and Mary II. These individuals were referred to as Non-juring, from the Latin verb iūrō, or jūrō, meaning "to swear an oath".

In the Church of England, an estimated 2% of priests refused to swear allegiance in 1689, including nine bishops. Ordinary clergy were allowed to keep their positions but after efforts to compromise failed, the six surviving bishops were removed in 1691. The schismatic Non-Juror Church was formed in 1693 when Bishop William Lloyd appointed his own bishops. His action was opposed by the majority of English Non-Jurors, who remained within the Church of England and are sometimes referred to as "crypto-Non-Jurors". Never large in numbers, the Non-Juror Church rapidly declined after 1715, although minor congregations remained in existence until the 1770s.