Indulgentarium Doctrina is an apostolic constitution about indulgences issued by Pope Paul VI on 1 January 1967. It responds to suggestions made at the Second Vatican Council, it substantially revised the practical application of the traditional doctrine relating to indulgences. The title is taken from the opening words of the original Latin text.

The apostolic blessing or papal blessing is a blessing imparted by the pope, either directly or by delegation through others. Bishops are empowered to grant it three times a year and any priest can do so for the dying.