The purpose of this research was to investigate the relationship between Forward Head Posture (FHP) with weight, height and weight of backpack in girl student. In order to conduct the present applied and descriptive-correlational research, which was conducted in the field, among the students of public schools in Amol city in the academic year of 1402-1403 in the primary, first and secondary education levels (3000 people), according to Morgan's table, 341 students were selected as a sample by stepwise cluster random sampling. Then, the height, weight, weight of the backpack and the FHP were assessed by photogrammetry and measured using AutoCAD software. The normal distribution of data was analyzed using Kalmogorov Smirnov tests and Pearson correlation coefficient were utilized for relationship. All statistical analyses performed by SPSS software version 26. The results showed that there is a significant relationship between weight and forward head syndrome in elementary, first and second high school students. Also, a significant relationship was observed between height and forward head syndrome in first secondary school students, but no significant relationship was found between height and FHP in primary and second high school school students. Finally, it was found that there was a significant relationship between the weight of the backpack and FHP in elementary school students. However, there was no significant relationship between the weight of the backpack and the FHP in the first and second high school students. Therefore, it is suggested that the authorities and families consider suitable solutions to reduce the weight and weight of students' backpacks in order to reduce the amount of forward head complications.
