Types of Politeness and Impoliteness Strategies of Lecturer and Students in English Education Classroom Interaction Sennya Nurditasari 1 , Masitowarni Siregar 2 , Winda Setiasari 3 {sennyanoermuse@gmail.com 1 , siregarmasitowarni@yahoo.com 2 ,windasetiasari@unimed.ac.id} State University of Medan 1,2,3 Abstract. The purpose of this study is to investigate the types of politeness and impoliteness used by Lecturer and Students in English Education Classroom. This study employed textual analysis design. This analysis applied Brown and Levison (1987) and Culpeper (1996). The sources of data were taken from 70 utterances which spoken by lecturer and students in classroom interaction at STKIP Budidaya Binjai. The findings revealed that there are four types of politeness strategies used by Lecturer and Students in classroom interaction. The Lecturer and Students used 30 Bald on Record, 8 Negative Politeness, 13 Positive Politeness and 7 Off Record. The findings also described that there are two types of impoliteness strategies used by Lecturer and Students in classroom interaction. The Lecturer and Students used 11 Positive Impoliteness, and 1 Negative Impoliteness. Keywords: Lecturer and Students, Classroom Interaction, Politeness and Impoliteness Strategy. 1 Introduction Classroom interaction is an essential aspect of the teaching and learning process. To establish effective classroom interactions in higher education, lecturers and students rely heavily on communication. One way to improve interpersonal interactions is to use polite language. To keep the connection joyful and avoid misunderstandings, teachers and students are encouraged to use polite language. However, both instructors and students use disrespectful language on a regular basis, either knowingly or unknowingly. Students must use formal language in the classroom, especially during debate and engagement. Furthermore, formal language interaction in the classroom is crucial for undergraduate students' speaking skills. The issue of politeness and impoliteness that occurs in classroom interactions, particularly at the university level, requires further research. This research is important because the author wants to know which of the politeness and impoliteness strategies are used most frequently by AISTEEL 2023, September 19, Medan, Indonesia Copyright © 2023 EAI DOI 10.4108/eai.19-9-2023.2340496