The present study was undertaken to evaluate the pubertal growth spurt in a group of Giza school male adolescents, using the developmental stages of the Middle phalanx of the middle finger (MP3) as a skeletal maturation index.This study was conducted as a part of research project between Ministry of Health and Faculty of Oral and Dental Medicine, Cairo University represented by Orthodontic Department. It included seven separate studies in different Egyptian governorates. This present study was conducted in Giza governorate.A total sample of 1500 adolescent males was included in the research. Their circumpubertal ages ranged from 11 to 16 years with mean age 13.36 years. Middle phalanx of the middle Finger (MP3) was digitally radiographed for each subject. Each film was interpreted to define its MP3 developmental stage and the data were collected and statistically analyzed.Based on the findings of this study, the following conclusions can be drawn:1. The mean skeletal maturity age (MP3-G stage) that represents the peak of height velocity (PHV) in Egyptian adolescent males of Giza was found to be 13.36 y ± 1.07 years which was approximately 7.27 months after pre-peak stage.2. The start of the pre-peak stage (MP3-FG) of pubertal growth was reached at 12.79 y ± 0.91 years. This means that the growth modulation treatment by functional orthodontic appliances should be done in male adolescents within range of 12.79y to 14.51y that represents the active period of pubertal growth between the pre-peak (MP3-FG) and the post-peak (MP3-H) stages respectively.The Egyptian male adolescents, of the studied sample, mature earlier than Saudi Arabians and native Indonesian adolescents, while later than the New Zealand and Rwandese boys3. The newly digital radiography of the MP3 region is definitely an available, simple technique of high clarity, low radiation. It is also cost-effective and time-saving for the assessment of the skeletal developmental stage, which is essential in diagnosis and treatment planning for orthodontists, pedodontists, as well as many other health disciplines.