Solemn Mass

Solemn Mass (Latin: missa solemnis), sometimes also referred to as Solemn High Mass or simply High Mass, is, when used not merely as a description, the full ceremonial form of the Tridentine Mass, celebrated by a priest with a deacon and a subdeacon, requiring most of the parts of the Mass to be sung, and the use of incense. The term "High Mass" is also used in the United States to describe the less elaborate Missa Cantata, which lacks deacon and subdeacon and some of the ceremonies connected with them.

These terms distinguish the form in question from that of Low Mass and Missa Cantata.

The parts assigned to the deacon and subdeacon are often done by priests in vestments proper to those roles.

A Solemn Mass celebrated by a bishop has its own particular ceremonies and is referred to as a Solemn Pontifical Mass.

The terms "Solemn Mass", "Solemn High Mass", and "High Mass" are also often used within Anglo-Catholicism, in which the ceremonial, and sometimes the text, are based on those of the Sarum Rite or the later Tridentine Mass. Lutherans (mainly in Europe) sometimes use the term "High Mass" to describe a more solemn form of their Divine Service, generally celebrated in a manner similar to that of Roman Catholics. Examples of similarities include vestments, chanting, and incense. Lutheran congregations in North America commonly celebrate High Mass in essence, but rarely use the term "Mass".

This article deals with Solemn Mass as celebrated according to the Tridentine use.