ABSTRAK Stunting masih menjadi permasalahan kesehatan masyarakat di Indonesia dengan prevalensi yang belum mencapai target nasional. Salah satu faktor risiko utama stunting adalah asupan gizi yang tidak seimbang, termasuk rendahnya praktik pemberian ASI eksklusif. Kurangnya pengetahuan ibu, dukungan sosial, serta keterbatasan peran kader kesehatan menjadi hambatan dalam keberhasilan ASI eksklusif. Kegiatan pengabdian masyarakat ini bertujuan untuk meningkatkan pengetahuan dan kapasitas kader posyandu dalam memahami serta menyampaikan edukasi mengenai ASI eksklusif sebagai upaya pencegahan stunting. Kegiatan dilaksanakan dengan desain edukasi partisipatif melalui kelas kader menggunakan metode penyampaian materi, demonstrasi teknik menyusui menggunakan phantom bayi, diskusi interaktif, serta pembagian booklet edukatif. Evaluasi dilakukan menggunakan kuesioner pretest dan posttest untuk menilai perubahan pengetahuan kader. Hasil evaluasi menunjukkan rerata skor pengetahuan meningkat dari 8,8 pada pretest menjadi 9,3 pada posttest. Kader menunjukkan pemahaman yang lebih baik mengenai manfaat ASI eksklusif, teknik menyusui yang benar, serta perannya dalam mendampingi ibu menyusui di masyarakat. Kelas kader edukasi ASI efektif dalam meningkatkan pengetahuan dan kapasitas kader posyandu. Penguatan peran kader melalui edukasi berbasis partisipatif berpotensi mendukung peningkatan praktik ASI eksklusif dan menjadi strategi penting dalam upaya pencegahan stunting secara berkelanjutan di tingkat komunitas. Kata Kunci: Stunting, ASI Eksklusif, Kader Posyandu, Edukasi Kesehatan, Pengabdian Masyarakat. ABSTRACT Stunting remained a public health problem in Indonesia, with prevalence rates that had not yet achieved national targets. One of the primary risk factors for stunting was inadequate nutritional intake, including low adherence to exclusive breastfeeding practices. Limited maternal knowledge, insufficient social support, and constrained involvement of community health cadres constituted major barriers to the successful implementation of exclusive breastfeeding. This community service activity aimed to improve the knowledge and capacity of posyandu cadres in understanding and delivering education on exclusive breastfeeding as a strategy for stunting prevention. The activity was conducted using a participatory educational design through a cadre education class. The methods included structured lectures, demonstrations of proper breastfeeding techniques using an infant mannequin, interactive discussions, and the distribution of educational booklets. Evaluation was performed using pretest and posttest questionnaires to assess changes in cadres’ knowledge. The evaluation results indicated an increase in the mean knowledge score from 8.8 in the pretest to 9.3 in the posttest. The cadres demonstrated improved understanding of the benefits of exclusive breastfeeding, correct breastfeeding techniques, and their roles in supporting breastfeeding mothers within the community. The exclusive breastfeeding cadre education class was effective in enhancing the knowledge and capacity of posyandu cadres. Strengthening the role of cadres through participatory-based educational interventions had the potential to support improved exclusive breastfeeding practices and represented an important strategy for sustainable stunting prevention at the community level. Keywords: Stunting, Exclusive Breastfeeding, Posyandu Cadres, Health Education, Community Service.