Mother Teresa will be made a saint on September 4.
Pope Francis set the canonisation date, paving the way for the nun who cared for the poorest of the poor to become the centre-piece of his year-long focus on the Catholic Church's merciful side.
The announcement was expected after Francis in December approved a second miracle attributed to Mother Teresa's intercession - the final hurdle to make her a saint.
The actual date falls on the eve of the 19th anniversary of her death.