This PhD focuses on the analysis of the intonation system of County Galway English (CGE). This work offers three prospects of reflection. 1) Document a variety of English which still shows shady areas particularly in the prosodic field, using a PAC corpus (PAC stands for Phonology of Contemporary English), for which we recorded several speaking tasks. This corpus of 33 speakers includes 30 hours of speech fully transcribed, and partially annotated for prosody. 2) Proceed to an East-West comparison between CGE and Southwest Dublin English. 3) Build the sociolinguistic profile of our speakers to analyse intonation patterns according to socio-economic, identity, geographical and linguistic variables (CGE is in daily contact to Irish with Irish-speaking regions, or Gaeltacht). We proceeded to the prosodic analysis of the corpus of read sentences, using the IViE (Intonational Variation in English) system of annotation with a focus on the melodic contours and the tonal alignment on nuclear syllables (last accent of an IP). We also ran a perception study among naive Irish inhabitants based on the recordings of the read corpus. The results show that CGE shares a few prosodic features with the English spoken on the East coast of Ireland (similar tonal alignment, identical contours for interrogatives, and the L*_% pattern mostly found among younger speakers). Nevertheless, when digging further, CGE also shows a system of intonation of its own. Some characteristics prove to be more West-specific, such as a prominent H*_L% contour (late fall) among non-Irish speakers of Galway, or the H*L_% (simple fall) spotted more regularly among Irish speakers living in the Gaeltacht. This PhD’s originality lies in the suprasegmental description of CGE as a bridge between Irish and English, languages which have long been studied aside. Our work also stands at the crossroads of several fields of study.