Introduction & Aim: Stunting is a nutritional problem associated with impaired growth and development in children. The complementary feeding period at 6–23 months is a critical phase for meeting children's nutritional needs. Health cadres play a strategic role in delivering nutrition-related information to families. This activity aimed to improve cadres' knowledge of complementary feeding and balanced nutrition to support stunting prevention among children under two years of age. Method of Activity: This community service activity employed a Planning, Implementation, and Evaluation (PIE) approach and was conducted in Airlangga Village, Gubeng District, Surabaya City. The target participants were health cadres. Education was delivered using PowerPoint presentations, leaflets, and videos through lectures, discussions, and question-and-answer sessions. The educational materials covered the concept of stunting, age-appropriate complementary feeding, feeding frequency, food texture, portion size, food variety, and balanced nutrition. Evaluation was conducted using pre-test and post-test assessments. Results: A total of 43 health cadres participated in the activity. Before the education, 29 cadres (67.4%) had inadequate knowledge, while 14 cadres (32.6%) had good knowledge. After the education, the number of cadres with good knowledge increased to 38 (88.4%), while those with inadequate knowledge decreased to 5 (11.6%). The analysis showed a significant difference in knowledge before and after the educational intervention (p=0.010) Discussion: The improvement in knowledge indicates that education on complementary feeding and balanced nutrition can strengthen cadres' capacity to support stunting prevention. As a link between health workers and families, cadres have the potential to promote the continued dissemination of health information through Posyandu.