Introduction: Food that is offered to complement breast milk in order to meet baby’s growing needs is called ‘complementary food’. Appropriate complementary feeding is vital for children’s health. Nurses play a role ineducating mothers regarding the same. This study conducted to compare the knowledge of mothers of babies aged 6-24months with nurses. Objective: To determine the level of knowledge and attitude about complementary feeding among the nurses and mothers. Methods: A descriptive cross–sectional questionnaire based study was carried out with 401 nurses of a tertiary care hospital in North Karnataka and 425 mothers of babies aged 6-24 months in August- September 2022 using a structured questionnaire. Results: Among the mothers, 53.5% were aged between 21- 30 years and 46.5% of them were degree holders. 69% initiated breast feeding soon after birth and 65.5% exclusively breast fed upto 6 months. Delayed initiation of complementary feeding was noted in 30.8% of mothers, 60.8% preferred homemade complementary feed. Food diversity was very low (10.1%) and the most mothers reduced frequency of feeding during common illnesses. Concept of ‘hot’ and ‘cold’ food existed among majority of the population. Nurses knowledge was better compared to mothers knowledge, but still requires improvement in many areas. Conclusion: Mothers knowledgeregarding complementary feeding is inadequate and practices are inappropriate. False beliefs as well as social taboos tend to wean the child at an inappropriate age and prevent consumption of nutritious food.Even in healthcare workers, this knowledge is lacking. Hence, it is essential to educate nurses to provide proper knowledge and education to prevent malnutrition and improve the health status of children.