The objetive of the study was to determine the relationship between nutritional status and hospitalization for acute respiratory infections, in children under 5 years of age, at Hospital III EsSalud, Iquitos 2023. A non – experimental, cross – sectional, correlational quantitative method was used. The population included children under 5 years of age hospitalized in the pediatric service during the year 2023. The sample is made up of 97 hospitalized children, during the year 2023. The results found were: Of the total samples, 97 (100%) hospitalized children, 49 (50.5%) corresponded to the male sex and 48 (49.5%) to the female sex, the mean age of the children was 20.2 months, with a SD of 16.4 months, minimum age 1 month and maximum of 59 months, for a N of 97 hospitalized children, the average hospitalization days were 3.53 with a SD of 1.81 hospitalized days, minimum day 1 and maxi...