Background: Malnutrition has profound effects on various aspects of child health, including respiratory function. This study investigates spirometric impairments in undernourished children, aiming to understand the impact of nutritional status on pulmonary function. Material and methods: The study included 1021q undernourished children, categorized into three groups based on Waterlow criteria: Normal (n= 51), Wasted (n= 30), and Stunted & Wasted (n= 21). Spirometric parameters, including Forced Vital Capacity (FVC), Forced Expiratory Volume in 1 second (FEV1), Peak Expiratory Flow Rate (PEFR), FEV1/FVC ratio, and Maximum Voluntary Ventilation (MVV), were measured for each participant. Statistical Analysis: Mean values and standard deviations were calculated for each spirometric variable in each group. The differences between groups were analyzed using ANNOVA, with significance levels indicated by p-values. Results: the pulmonary functions (FVC, FEV1, PEFR, FEV1/FVC ratio, MVV) show significant variations among the Normal, Wasted, and Stunted & Wasted groups. Conclusion: This study provides evidence of spirometric impairments in undernourished children, emphasizing the importance of nutritional interventions to support optimal respiratory health. Understanding these associations contributes to a comprehensive approach in addressing the health challenges faced by undernourished pediatric populations.