Missa Sanctissimae Trinitatis (Mass of the Holiest Trinity) in A minor, ZWV 17, is a vocal-instrumental sacred work, written by Czech Baroque composer Jan Dismas Zelenka.
Missa Santissimae Trinitis is the composition of combined sacred style, which not only divides the liturgy text only according to the conventional Kyrie, Gloria, Credo, Sanctus and Agnus Dei, but also into shorter parts which form independent musical movements.
Similarly, the concertante choruses (Parts IV, IX and XI) are represented with modern ritornellos.
The opposite pole of the chorus concerto are the massive choral fugues - their dialogue here not only demonstrate the composer's technical mastery, but also illustrate the intellectual depth and significance of the work.
As with Zelenka's other High Mass compositions there are no brasses in the orchestration, which includes only organ, six violins, two viols, cello, double bass, two oboes, bassoon and archlute, expanded by two solo flutes and a chalumeau.