Background and Objectives: Breast milk is the food designed by nature for human babies. Breast milk and breastfeeding have much health, emotional and practical benefits for the mother and the baby. Breast feeding is a unique, exciting and often joyous time in a woman’s life. Breast milk is designed by nature. Primigravidae is the one who is more anxious about breast feeding because of the lack of previous exposure to breast feeding. In order to educate and encourage the primigravidae, to improve their knowledge regarding breast feeding, the study was conducted to evaluate the Effectiveness of video assisted teaching regarding knowledge on breast feeding among primigravidae attending antenatal OPD at selected maternity hospital, Bangalore. Methods: Pre-experimental design, with purposive sampling method was used. Information was collected from 40 primigravidae regarding breast feeding using the structured interview schedule. Video assisted teaching was implemented and post-test was conducted after 7 days to find the effectiveness. Results: Majority of respondents were from 19-26 years were Hindus, belongs to nuclear family, completed middle school education, occupation being home maker, monthly income below Rs. 3,000, attained menarche at 19-21 years; between 32-34 wks of gestation. The overall mean knowledge score in the pre-test was 37.9% and 79.5% in the post test with enhancement of 41.5% and it was significant at 5 % level. Analysis of socio-demographic variables showed significant association between age in years, occupation, age at menarche, gestational age with knowledge score at 5% level (P>0.05). Interpretation and Conclusion: Overall findings showed that pre-test knowledge scores were found to be 37.9% and after, video assisted teaching knowledge of primigravidae was enhanced by 41.5% regarding breast feeding. Hence the result has proved that video assisted teaching was effective in improving the knowledge of primigravidae on breast feeding.