The study of self-efficacy and its impact on human performance has intrigued many scholars during the last two decades, for example, Clayson and Sheffet, 2006; Nauta, 2004; Muijsand Rejnolds 2001; Bandura, 1997 and Soodak and Podell, 1993. This study was conducted with the objective to find out the impact ofteacher self-efficacy on the secondary school students' academic achievement. For this purpose, sixty (60) secondary school teachers and a hundred (100) secondary school students in Chiltan Town of Quetta city were randomly selected. To collect the data, teacher self-efficacy questionnaire for teachers was used and to measure students' academic achievement a test was developed. Data were analyzed through Pearson Correlation and Multiple Regressions. The findings of the study revealed that teacher self-efficacy has a positive impact on the students' academic achievement. The results of the study and their pedagogical implications have been discussed, and recommendations have been provided for further researches.