Background: Pneumonia is part of respiratory tract infections in children and is one of the diseases that causes the most deaths in toddlers. According to data from the Ministry of Health of the Republic of Indonesia for 2021, based on 34 provinces of pneumonia in toddlers, Bali ranks ninth with the largest coverage of pneumonia in toddlers, namely 28.6% of cases with 23 cases of deaths in toddlers. The purpose of this research is to describe the mapping and patterns the spread of pneumonia in toddlers in Denpasar City in 2022 based on Geographic Information Systems (GIS Methods The design in this study uses descriptive quantitative with the research design used is cross sectional. Sampling of 260 samples was carried out using a purposive sampling technique. Data analysis using spatial classification analysis. Results: From the results of the study it was found that the spread of pneumonia in toddlers in Denpasar City in 2022 was classified into three categories namely high, medium and low. The pattern of distribution of pneumonia cases in Denpasar City in 2022 is the highest in West Denpasar District with 94 cases. Conclusion: The conclusion of this research is that the West Denpasar Subdistrict region has the highest cases and the lowest cases are found in the East Denpasar Subdistrict region. Age, gender and population density are risk factors that influence the high incidence of pneumonia in children under five in Denpasar City.