The Archdeacon of Westminster is a senior ecclesiastical officer within the Chapter of the Royal Peculiar of Westminster Abbey in London. The holder of the post oversees relationships with the twenty-four parishes of which the Dean and Chapter are patrons, and is responsible for the pastoral care of the staff and volunteers of the Abbey.

The Dean and Chapter of Westminster are the ecclesiastical governing body of Westminster Abbey, a collegiate church of the Church of England and royal peculiar in Westminster, Greater London. They consist of the dean and several canons meeting in chapter and are also known as the Dean and Canons of Westminster.