The aim of this thesis was to analyze the phonology of the speech of the inhabitants of Banjaluka settling in Zagreb, that is, the analysis of their vocalism, consonantism and prosody. Their speech was analyzed in relation to the speech of the control group, consisting of respondents from Banja Luka, in order to compare these two speeches with each other and to indentify possible changes that occurred under the influence of the Zagreb city dialect. The research began by collecting recordings of their spontaneous speeches, which were then analyzed in detail by perceptual and acoustic analysis, studying their vocal, consonantal, and prosodic features. The second part of the research involved reading a text written in the standard language, in order to further check some prosodic problems such as the realization of accented lengths, pronunciations of pronouns and pronunciation of accented units composed of accents and prepositions, but also to study their relationship to standard language. The experimental group was consisted of four respondents divided into age groups - older and middle, while the control group consisted of four respondents, also divided into age groups. The results of the research showed that the New Štokavian speech of immigrant respondents did not change significantly under the influence of Zagreb city speech, except in some cases in middle-aged respondents, at the level of prosody, because they were more often exposed to Zagreb speech. Furthermore, as to their relation to the standard language, it was noticed that during the reading of the text the prosodic peculiarities of all respondents experienced changes, ie the respondents used non-standard places of emphasis modeled on Zagreb speech, thinking that they speak more standard.