This thesis is an examination of the regional dialectal influence of colloquial varieties of Arabic on the allophony of vowels in Modern Standard Arabic. It is an expansion of research done by Al-Ani (1970), who claims that speakers' native, colloquial dialect of Arabic has an influence upon the realization of phonological patterns in standardized MSA, and that these influences can be seen to differ in small but noticeable and structured ways. This thesis lends support to Al-Ani's research on Iraqi Arabic by examining the dialects spoken in Lebanon and the United Arab Emirates. Analysis of the data obtained was conducted under the methodology of Articulatory Phonology (Browman & Goldstein, 1992), a theory of phonology which examines phonological patterns in terms of articulatory gestures. This thesis shows that Articulatory Phonology is a successful method of analysis, that not only describes phonological patterning, but explains it in light of articulatory gestures.