Introduction: WHO defines Adolescence is the age group between 10 to 19 years [1]. It is a transitional stage from appearance of secondary sexual characters to sexual maturity. Today every fifth person in India is an adolescent [3]. Adolescent health is important as they are demographic force, economic force, future heath of nation and they have right to participate. Aims and Objectives: 1 To study the magnitude of different gynaecological morbidities in adolescent girls attending out patient department of obstetrics and gynaecology in new civil hospital, Surat. 2 To study the socio-demographic determinants and nutritional status. Methods: A observational study conducted including total 197 consenting subjects between age 11-19 years attending out patient department of our tertiary care hospital Surat. After detailed history taking, general and gynaecological examination was done followed by if needed investigations include hemogram, coagulograms, hormonal survey, sonography and other radiological investigations done. Data analysis done by Microsoft excel and open EPI software. Results: Menstrual disorders found to be the commonest gynaecological problems (76.14%) includes irregular menses, amenorrhoea, dysmenorrhoea. DUB was the commonest among irregular menses. Statistical significance found between PCOD and high BMI and socioeconomic class, puberty menorrhagia and dysmenorrhoea found statistically significant with age of 14-16 years, genital infections with married adolescents. Conclusion: In Adolescents menstrual disorders are more common but other problems also significant so scared resources should be directed for their health so future generation health can be improved. Correlated factors can be used in their prevention strategies.