Missa solemnis is Latin for solemn mass, and is a genre of musical settings of the ordinary mass, which are festively scored and render the Latin text extensively, opposed to the more modest Missa brevis. In French, the genre is "Messe solennelle". The terms came into use in the classical period.

When "Missa solemnis" is used as a name, without referring to a composer, Beethoven's work is generally implied. Some of the greatest compositions in the genre have unique common names other than "Missa solemnis"—namely,Bach's Mass in B minor and Mozart's Great Mass in C minor. Some works are solemn settings in proportion and scoring, but are not called a "Missa solemnis", for example several late settings of both Haydn and Schubert, and three settings by Anton Bruckner.

Masses named "Missa solemnis" by well-known composers include:

Other composers who wrote works titled "Missa solemnis" have included France Ačko (1941), Hendrik Andriessen (1946), Marco BettaFrantišek BrixiAntonio Buonomo (1983), Alfredo Casella (1944), Paul CrestonGeorg Druschetzky(1804), Bohumil Fidler (1901), Joseph-Hector FioccoKonstanty GorskiMichael Haydn (1772), Václav Emanuel HorákSigurd Islandsmoen (1954), Friedrich KielKarel Blažej KopřivaJean LanglaisJosef Lammerz (1990), Colin MawbyBoleslaw OciasAntonio SacchiniJohann Nepomuk SchelbleWolfgang SeifenJohann Baptist Wanhal (1778), Louis Vierne, and Bedřich Antonín Wiedermann (1848).

Festive mass settings in other languages include Jakub Jan Ryba's Czech Christmas Mass.

Masses which are solemn but not named "Missa solemnis" include:

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