Background: Evaluate the Effectiveness of Structured Teaching Program on Assertiveness Training for Social Anxiety among Adolescent girls. Methods & Result- Pre- experimental design one group pre-test and Post-test was used for evaluating the social anxiety among adolescent’s girls. 56 adolescence girls were selected through convenience sampling technique. Pretest was conducted by using Modified Social Interaction anxiety scale. Assertiveness Training was given for 45 minutes (7 Sessions) & Posttest was assessed. In pretest 4 (7%) had no anxiety, 18 (32%) had mild anxiety, 14 (25%) had moderate anxiety, 14 (25%) had severe anxiety, 6 (11%) had extremely anxiety. In posttest 30 (54%) had no anxiety, 19(34%) had mild anxiety, 5 (9%) had moderate anxiety, 2 (3%) had severe level of anxiety among adolescence. There results showed that the assertive training is effective for adolescents girls is 2.00 (p>0.05%).The results showed that there is no significant association between level of social anxiety score and selected demographic variables regarding age, birth status, type of family, residing area,religion, educational status of parents, leisure time activities, how you engaged with socialization. Conclusion: This study concluded that college students unaware about assertiveness training, self esteem and they are frequently facing social anxiety. This study also pointed out Nursing students should receive adequate training regarding the techniques of assertiveness training, should assist in implementing public health awareness campaigns aimed at reduce level of social anxiety & provide knowledge, resources and leadership for establishing public health policies that focus on assertiveness training program for reducing level of social anxiety among adolescents.