Adolescence is a transitional stage of physical and psychological development that generally occurs during the period from puberty to adulthood. There can be many reproductive health issues which an adolescent has to deal with. Leucorrhoea is one among them. The term leucorrhoea denotes a thick, whitish vaginal discharge containing mucus and pus cells that may occur at any age & affects most women. Approximately 75% women experiences leucorrhoea in their lives. This study was under taken to assess the knowledge regarding leucorrhoea among adolescent girls in Govt. AMT School, Bakshi Nagar Jammu (J&K).The sample consisted of 60 adolescent girls. Purposive sampling technique was used to select the sample. Socio-demographic profile, a self structured questionnaire were used to collect the data from subjects. The results revealed that maximum subjects 27(45%) were having poor knowledge followed by 18(30%) were having good/average knowledge, 10(16.6%) and 5(8.3%) were having very good and excellent knowledge respectively. Thus, it is concluded that there is need to educate the adolescent girls about patho physiology, causes, prevention and management of leucorrhoea so as to improve their knowledge and practice and to decrease the rate of infections among them.