The aim of this research is to analyze the two varieties of British and American English in respect of their phonetic differences. Although the language of Britain and America is English, there are some pronunciation, vocabulary, spelling, grammatical, idiomatic and other differences between them. In this research, the phonetic differences between these two English varieties have been analyzed in terms of their vowels (including monophthongs and diphthongs) and consonants. The method used in this research is comparative whose data have been collected through library and internet sources. Comparative method is a linguistic method used to compare and contrast two or more languages. The obtained results, based on the comparison between British and American pronunciation, will get English language learners to the recognition, conscious knowledge and correct usage of British and American English.