Studie Jany Spáčilové se zabývá mešními kompozicemi hudebního skladatele Antonia Caldary, dochovanými v moravských hudebních sbírkách., This article is dedicated to the problem of the erroneous attribution of authorship of Masses to Antonio Caldara in Moravian collections of church music. It contains information about extant records of Masses by Caldara and methodological discussion concerning the reliability of sources with respect to authorship. Also included is an overview of Caldara sources of Moravian provenience, including both extant music and entries in period inventories. Attention is dedicated both to compositions by others regarded in Moravia as works by Antonio Caldara, and to works by Caldara under the names of other composers. Works identified as having been written by other composers are presented in the form of tables, including signatures of all concordant sources found so far in European libraries. The purpose of the article is to give an idea of the standing of Caldara’s works in the repertoire of Moravian church music and to prepare material for a future thematic catalog of Moravian sources of Masses by Caldara., Jana Spáčilová., Rubrika: Studie, and Anglické resumé na s. 75, anglický abstrakt 45.