Adolescence is a significant period in the life of a woman. Adolescent girls often lack knowledge regarding reproductive health including menstruation which can be due to socio-cultural barriers in which they grow up. Menstruation is a physiological phenomenon which is unique to females that begins in adolescence. As the girls lack knowledge about menstruation and due to lack of hygiene, they are likely to suffer from RTI’s, the investigators created an insight to conduct a study to assess the knowledge and attitude of menstrual hygiene among adolescent girls in 9th standard in selected school at Pondicherry. One group pretest- post test research design was chosen for the study.A formal structured teaching program was conducted after the pre test and later the post test was done. Among the subject there was significant difference between pre and post test knowledge and attitude score with respect to different variables.