The Roman Rite (Latin: Rītus Rōmānus) is the most common ritual family for performing the ecclesiastical services of the Latin Church, the largest of the sui iuris particular churches that comprise the Catholic Church. The Roman Rite governs rites such as the Roman Mass and the Liturgy of the Hours as well as the manner in which sacraments and blessings are performed.

The Roman Rite developed in the Latin language in the city of Rome and, while distinct Latin liturgical rites such as the Ambrosian Rite remain, the Roman Rite has gradually been adopted almost everywhere in the Latin Church. In medieval times there were numerous local variants, even if all of them did not amount to distinct rites, yet uniformity increased as a result of the invention of printing and in obedience to the decrees of the Council of Trent of 1545–1563 (see Quo primum). Several Latin liturgical rites which had survived into the 20th century were abandoned after the Second Vatican Council. The Roman Rite is now the most widespread liturgical rite not only in the Catholic Church but in Christianity as a whole.

The Roman Rite has been adapted through the centuries and the history of its Eucharistic liturgy can be divided into three stages: the Pre-Tridentine Mass, Tridentine Mass, and Mass of Paul VI. It is now normally celebrated in the form promulgated by Pope Paul VI in 1969 and revised by Pope John Paul II in 2002, but use of the Roman Missal of 1962 remains authorized under the conditions indicated in the 2021 papal document Traditionis Custodes.

The Roman Rite is noted for its sobriety of expression. In its Tridentine form, it was noted also for its formality: the Tridentine Missal minutely prescribed every movement, to the extent of laying down that the priest should put his right arm into the right sleeve of the alb before putting his left arm into the left sleeve (Ritus servandus in celebratione Missae, I, 3). Concentration on the exact moment of change of the bread and wine into the Body and Blood of Christ has led, in the Roman Rite, to the consecrated Host and the chalice being shown to the people immediately after the Words of Institution. If, as was once most common, the priest offers Mass while facing ad apsidem (towards the apse), ad orientem (towards the east) if the apse is at the east end of the church, he shows them to the people, who are behind him, by elevating them above his head. As each is shown, a bell (once called "the sacring bell") is rung and, if incense is used, the host and chalice are incensed (General Instruction of the Roman Missal, 100). Sometimes the external bells of the church are rung as well. Other characteristics that distinguish the Roman Rite from the rites of the Eastern Catholic Churches are genuflections and keeping both hands joined together.

The principles underlying the Second Vatican Council's liturgical reforms were applicable to the Roman Rite and to the Eastern rites, although the practical norms set out in the Council's Constitution on the Sacred Liturgy applied only to the Roman Rite.

Jesuit priest Rune P. Thuringer, writing in 1965, noted that "The eucharistic liturgy of the state Church of Sweden, which is Lutheran, is closer in many respects to the rite of the Roman Mass than that of any other Protestant church."

In his 1912 book on the Roman Mass, Adrian Fortescue wrote: "Essentially the Missal of Pius V is the Gregorian Sacramentary; that again is formed from the Gelasian book, which depends on the Leonine collection. We find the prayers of our Canon in the treatise de Sacramentis and allusions to it in the 4th century. So our Mass goes back, without essential change, to the age when it first developed out of the oldest liturgy of all. It is still redolent of that liturgy, of the days when Caesar ruled the world and thought he could stamp out the faith of Christ, when our fathers met together before dawn and sang a hymn to Christ as to a God. The final result of our inquiry is that, in spite of unsolved problems, in spite of later changes, there is not in Christendom another rite so venerable as ours." In a footnote he added: "The prejudice that imagines that everything Eastern must be old is a mistake. Eastern rites have been modified later too; some of them quite late. No Eastern Rite now used is as archaic as the Roman Mass."

In the same book, Fortescue acknowledged that the Roman Rite underwent profound changes in the course of its development. His ideas are summarized in the article on the "Liturgy of the Mass" that he wrote for the Catholic Encyclopedia (published between 1907 and 1914) in which he pointed out that the earliest form of the Roman Mass, as witnessed in Justin Martyr's 2nd-century account, is of Eastern type, while the Leonine and Gelasian Sacramentaries, of about the 6th century, "show us what is practically our present Roman Mass". In the interval, there was what Fortescue called "a radical change". He quoted the theory of A. Baumstark that the Hanc Igitur, Quam oblationem, Supra quæ and Supplices, and the list of saints in the Nobis quoque were added to the Roman Canon of the Mass under "a mixed influence of Antioch and Alexandria", and that "St. Leo I began to make these changes; Gregory I finished the process and finally recast the Canon in the form it still has."