The main purpose of this paper is to examine the level of communication apprehension (CA) among Final-Year Political Sciences students studying English for Specific Purposes (ESP) at Chlef University, and then investigate the main factors that lead to their CA in the ESP classroom. The instruments that were used for data collection in the study are two questionnaires to 50 students and an interview with 4 teachers. This study contains four chapters. The first two chapters are mainly theoretical and the last two chapters are practical. The findings of the study revealed that most students had high level of CA with the relative contribution of two main reasons: instructional and psychological factors to the situation. The last chapter was mainly meant to present some suggestions and recommendations on to reduce communication apprehension among ESP students and improve their speaking skills.