This study aims to investigate the perception of undergraduate students about their lecturers' behaviours in their learning environment. Behaviour is the explanation of observable outcomes and interaction between students and instructors. Behaviour can be positive, negative, effective or ineffective, and the way in which lecturers behave with their students in the learning environment may affect their learning experience and motivation. A Quantitative research design was employed in conducting the study. A questionnaire with 27 items was used to collect data from 140 randomly selected respondents from Takhar University, Afghanistan. SPSS version 25.0 was used to analyze the data. Descriptive statistics and inferential statistics, i.e., Independent Samples t-test and One-Way ANOVA were employed in data analysis. The findings indicate that the students had a positive perception about their lecturers' behaviours in the learning environment. The study also revealed that there did not appear to be any statistically significant differences in participants' responses by their gender or the classes they took. The findings of the current study may lead to policies with regard to lecturers' behaviours and inform instructors to improve classroom practices in the learning environment.