Summorum Pontificum (English: Of the Supreme Pontiffs) is an Apostolic Letter of Pope Benedict XVI, issued "motu proprio" (i.e. on his own initiative). The document specified the rules, for the Latin Rite of the Catholic Church, for celebrating Mass according to the "Missal promulgated by John XXIII in 1962" (the form known as the Tridentine Mass), and for administering most of the sacraments in the form they had before the liturgical reforms following the Second Vatican Council.

The document, dated 7 July 2007 and in force since 14 September 2007, was released along with a letter in which Pope Benedict explained his reasons for issuing it.

The document replaced the motu proprio Ecclesia Dei of 1988, which allowed individual bishops to establish places where Mass could be said using the 1962 Missal. It granted greater freedom to use the Tridentine liturgy in its 1962 form, stating that all priests may freely celebrate Mass with the 1962 Missal privately, without having to ask for permission from anyone. It also provided that pastors (parish priests) and rectors of churches should willingly accept requests from stable groups who adhere to the preceding liturgical tradition ("ubi coetus fidelium traditioni liturgicae antecedenti adhaerentium continenter exsistit" - Article 5) for permission for a qualified priest to celebrate Mass for them using the 1962 Missal, and should "ensure that the welfare of these faithful harmonises with the ordinary pastoral care of the parish, under the guidance of the bishop".