This study examines the interference of Javanese in the pronunciation of IAIN Kediri students. There are two problems to be discussed in this study. The first is what the interferences of Javanese vowels in the pronunciation of English vowels. The second is what the interferences of Javanese consonants in the pronunciation of English consonants. The aim of both problems is to know what Javanese vowels and consonants which give interference to English vowels and consonants. This study employs descriptive qualitative aiming at describing how Javanese vowels and consonants interfere students‟ English pronunciation.The subjects are represented by Javanese students‟ at the fourth semester of Department of English Language Education in IAIN Kediri. Their mother tongue is Javanese language. The subjects are twenty Javanese students. Fourteen students are female and the rest are male. The subjects are asked to read the words on the list given by the researcher. The list of words contains all vowels and consonants in English. Then, the English vowels and consonants which are mispronounced are analysed through the differences of vowels and consonants feature change. This study revealed that the subjects encountered a number of pronunciation problems consisting of Javanese interference in English vowels and consonants. The result of the test showed that there weresix English vowels which were mispronounced by Javanese students. They are:[u:], [ə], [ɜ:], [ɔ:], [æ], [ɑ:] and [ɒ]. However, only three out of six vowels which are indicated to be interfered by Javanese. They are:[æ], [ɑ:] and [ɒ]. These English vowels are interfered by Javanese vowels [e], [a] and [u]. Furthermore,there were sixteen English consonant sounds which were mispronounced by Javanese students. They are:[p], [b], [t], [d], [k], [g], [tʃ], [dʒ], [f], [v], [θ], [ð], [z], [ʃ], [ʒ] and [ŋ]. However, not all the consonants mispronounced because of the interference of Javanese consonant. Three out of sixteen consonant sounds were not interfered by Javanese. They are:[dʒ], [f] and [z]. While the other thirteen consonants were interfered by Javanese. They are: [ph ], [b], [th ], [d], [kh ], [g], [tʃ], [v], [θ], [ð], [ʃ], [ʒ] and [ŋ]. Furthermore, Javanese consonant sounds which gave interference in producing English consonants are: [p], [bh ], [t], [ᶁ], [k], [gh ], [c], [f], [t], [s] and [ɲ].This study also revealed some major causes which lead the respondents‟ English mispronunciation. They are: borrowing, overgeneralization, deletion and devoicing.

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