Aim: The study aimed to find out the knowledge and understanding of the adolescent health care services among health care professionals in two major tertiary care hospitals in Saudi Arabia. Methods: This was a cross sectional study conducted among 400 physicians and nurses of both genders at two major military hospitals at Riyadh and Al Kharaj in Saudi Arabia from July 2017 to March 2018. A close-ended survey was designed and administered to assess variables associated with health care professionals knowledge and understanding. Results: Various health and social risk problems, including trauma, diabetes, hypertension, bronchial asthma, acne, rhinitis, obesity, underweight, sexual problem, smoking’s, substance abuse, domestic violence, eating disorder, mental disorder were highly prevalent among adolescents in Saudi Arabia. Only 6.8% respondents were managed to guess an inclusive age range for the adolescence period (10-19 years). Of the total respondents, 51% thought that a dedicated adolescence healthcare service is needed while only 40.3% of them agreed that such dedicated service can be offered by primary care team. Conclusion: A dearth of knowledge and understanding about adolescents health care services among the health care professionals in Saudi Arab.