The observational study was conducted to see the impact of teachers' nonverbal behavior on academic achievement of learners. This also investigated the relationship of nonverbal communication of teachers working in different educational institutions. Main objectives of study were to measure nonverbal behavior of teachers' both male and female working in English medium Federal Government Cantt Garrison schools, Army Public schools and Private schools and to find out the relationship between teachers' nonverbal behavior and academic achievement of students. 90 science teachers were randomly chosen through cluster sampling technique. An observation form with seven-point rating scale (semantic differential) based on Galloways' categories of nonverbal communication was developed. The rating scale complemented verbal dimension of Flanders' interaction categories through nonverbal dimension. Design of research was descriptive cum observational. The statistical techniques of frequency distribution, mean, standard deviation, and ANNOVA and t-test were used for analysis. The results were generalized to the population by means of appropriate inferential statistics. It was found that the nonverbal behavior of the teachers was found to be consistent with their verbal behavior.