The subject of this research are the characteristics and particularities of roman mystery cults, their changes in time on the territory of the Roman province of Dalmatia. Mysteries, gr. τὰ μυστὴρια (pl.), represent ancient ceremonies of initiation, which implied a special, privileged contact with the deity, and the accompanying positive changes in the lifestyle of the participants. Most of the roman mystery cults, with the exception of the cult of Mithras, had an "official" aspect, which also needs to be examined in order to get a full picture of these complexed cults. This is the reason why, in title, they are united by the same appellative “mystery”, but also the reason why they will be examined separately, within individual municipalities and territories. Since the work includes the historical and geographical area of the roman province of Dalmatia, the metroac, the isiac cults, as well as the cult of Mithras and Sabazius are studied. Monuments of those cults are most numerous in regard of other mystery cults in Dalmatia. The topography of the findings will be analysed as well as the possible position of the shrines; legal, social status of the followers will also be discussed with particular reference to the priests and cult associations; the formal and iconographic peculiarities of figurative monuments are being studied as well. Regarding the obtained data, historical and political circumstances, the aspects of worship of individual cults and their significance within single communities and regions of Province are defined.