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Abstract  Lecturers play a very important role in delivering materials understandable for the students. Using language that is appropriate for students’ abilities, so that learning in the classroom runs smoothly, and the material presented can be conveyed and understood by all students is the task of the lecturers. The present study aims to explore the students’ perception on the implamentation of Full English in a private university in Landak, region West Kalimantan. This research was conducted because there was a case where lecturers at CATHOLIC UNIVERSITY Of SANTO AGUSTINUS HIPPO implemented this method by teaching in Full English in the classroom. Therefore, this study aims to explore or find more information about how students perceive learning that implements Full English in the classroom, by interviewing several students at CATHOLIC UNIVERSITY Of SANTO AGUSTINUS HIPPO. The study employed Qualitative research method to reveal the students’ perception. 40 students imploved in the study. The data was collected from questionnaire and interview. The results show that the majority of students agreed with the implementation of Full English in the classroom. However, on the other hand, there are also some students who believed that they encounter difficulties in learning Full English in the classroom because they are not fluent in English yet, which can hinder their understanding of the material presented, especially for students who do not yet understand English well.Keywords: English, Full English, Students Abilities, Students’ Perceptions.