The article is part of a stream of research aimed at learning the history and form of the liturgical repertoire cultivated in diocesan and monastic centres in medieval Poland. It deals with antiphons ad introitum, i.e. chants sung in conjunction with the psalmody at the beginning of the Mass. The main focus is on identifying the selection and liturgical use of these pieces in local traditions. The textual and melodic records of the antiphons preserved in Polish pre-Tridentine graduals were used as a source context. On this basis, two groups of messages were distinguished, which were not equivalent in terms of quantity and quality. The first group consisted of 145 antiphons taken from the Roman musical heritage, which in Polish sources were generally in line with European practice. More attention was paid to the sanctoral chants, as their selection varied more in different traditions. The second group included more than 30 compositions that extended the original Roman resource. These chants were mainly found in the context of saints', Marian and votive formulae. Their transmissions were characterised by great heterogeneity, due to adaptation to local needs, which manifested itself, among other things, in a great variety of melodies. For these reasons, many of the antiphons in this group reflect the peculiarities of local traditions, and some of them can be considered indigenous contributions to the general cultural heritage.