ABSTRACT Ikhwan Maulana , 2020, The Students’ Perception of Code-switching Used by English Lecturer in English for Specific Purpose Class at the Fifth Semester of English Department at IAIN Madura. Thesis, English Teaching Learning Program (TBI), Tarbiyah Faculty, The State Islamic Institute (IAIN) Madura, advisor: Henny Uswatun Hasanah, M. Pd. Keywords: Code-switching, English Lecturer…