Academic Journal PERSPECTIVE: Language, Education and Literature Vol 7 (2) November 2019, 65-74 65 INACCURATE PRONUNCIATIONS OF ENGLISH VOWEL SOUNDS BY ONLINE INDONESIAN ENGLISH TEACHERS IN THREE YOUTUBE CHANNELS Maria Dewi Rosari 1) , Ouda Teda Ena 2) Sanata Dharma University, Yogyakarta, Indonesia mariadewirosari@gmail.com 1) , ouda@usd.ac.id 2) Received: September 9, 2019 Accepted: November 30, 2019 Published: November 30, 2019 Abstract Many English learners use English Teaching Channels on YouTube as an alternative source of learning. Most of those channels were organized by Indonesian teachers. However, the qualities of the teaching presentations on these channels are varied. Inappropriate use of vocabulary, inaccurate grammar, and mispronunciations are often found in these channels. This research attempts to study the inaccurate pronunciations of the English teachers. The study is necessary due to the fact that learners consider online English teachers as good language model and as an alternative to access English learning materials. The result of the study shows that there are nine types of English vowels that are pronounced inaccurately by the teachers. Ten of the inaccurately pronounced English vowels are absent in Indonesian vowel system. The finding of the research, therefore, can be cautions and suggestions for viewers of English Teaching channels on YouTube, and Indonesian English teachers when learning English and or teaching this language online. Keywords: English vowels, Indonesian vowels, mispronunciation, online Indonesian English teachers INTRODUCTION Pursuing a quality English education is somehow difficult especially for students living in rural areas. Some of the barriers in obtaining a quality education in rural areas are less qualified teachers and limited learning materials such as books (Hossain, 2016; Rahmadi, Istiqamah, Adriyanto, 2010). As the results, students in rural areas fail to get adequate learning resources and thus they could end up with insufficient English language exposure. To overcome those issues, one of the attempts that has been made is the creation of online English teaching videos. Such online videos could be accessed easily from various websites in the internet, one of which is YouTube. The researchers chose YouTube rather than other websites that also become providers of online English teaching videos because this website is one of the most accessed and popular websites in the world (Alexa, 2011). Up until now, there have been an extensive number of English teaching videos uploaded to YouTube. Those videos cover a wide variety of topics and target language and