The purpose of study was to evaluate the Impact of Effective Teachers on Students’ Academic Achievements. The main objectives of the study were (1) to identify the traits of effective teachers (2) to investigate the skills employed by effective teachers to enhance effectiveness of teaching process (2) to explore the effects of effective teaching on students achievements, (3) To identify the principles of effective teaching (4) to identify the bottlenecks in effective teaching learning if any, and suggest measures to overcome these. The total sample included 200 subjects which comprised 20 heads of institution, 50 teachers from different educational institutions administered by Federal Government Educational Directorate, Islamabad, and 130 students selected randomly. Two questionnaires were developed for teachers and students separately to collect the basic information about teachers’ Academic qualifications, professional qualifications and the methodology/ principles employed by teachers to ensure effective teaching. Items regarding impediments of effective teaching and their remedial measures were also included in the questionnaire. For the statistical analysis of data, the Arithmetic mean, percentage and correlation were computed. Conclusions and recommendations were made based on findings of the study.