Diabetes Mellitus (DM) type 1 is considered one of the most chronic diseases that affect adolescents and affects various aspects of their lives due to its many complications. The success of managing diabetes in the adolescent age-group depends on their self-care، which includes a strict commitment to various healthy behaviors، which may be difficult to follow in this group. Here، the adolescent needs support and social support to be able to adhere to the healthy behaviors. Aim of the study is to assess the relationship between the level of social support and the adolescents' attitude towards healthy behavior. Material and Methods: Research Design: A descriptive correlational Design was used in this study. Setting: The data was collected in the Diabetes Care Center in Lattakia- Syria. Sampling: the study was conducted on a convenient sample of 150 adolescents diagnosed with type 1 diabetes of both sexes. Tools: three tools were used in the present study namely, Socio demographic and clinical data, Attitude toward healthy behaviors among diabetic adolescents scale and social support among diabetic adolescents scale. Results:    93.3% of the students had positive attitude toward healthy behavior , 98% of the students reported  high social support in family domain, 89.3% of them reported high social support in in physician's domain and 74% of the students reported high social support in friends' domain while 74% of the students had high social support in the three domains.94.6% of the students who reported high social support had a positive attitude toward healthy behavior with a statistical significant relation was found P= 0.028.Conclusion : there is a positive attitude towards healthy behavior among the majority of the students moreover، most of the students showed high level of social support while the social support is higher، in the family domain than physician and friends domains. The results also showed that there is a positive relation between the presence of social support and diabetic adolescents' attitudes towards healthy behavior. Recommendations: The study recommended promoting health education about social support and its importance in enhancing adolescents' attitude towards healthy behavior.