Background: Fever is a condition that occurs as a result of infection or inflammation caused by bacteria, viruses, other pathogens, as well as factors such as tumor necrosis and interferon. Based on the 2022 Health Profile of the Special Region of Yogyakarta, the prevalence of fever in Yogyakarta was recorded at 0.36%. One of the common problems associated with fever is an increase in body temperature. Non-pharmacological therapies, such as the application of compresses, can help reduce body temperature in children. Shallots contain various substances, including cycloalliin, phloroglucinol, quercetin, methionine, and kaempferol, which may have natural antipyretic and anti-inflammatory properties. Purpose: This study aimed to describe the application of shallot compress therapy to reduce fever in a preschool-aged child at the Pediatric Polyclinic of Wates Regional Hospital. Method: This study used a descriptive method with a case study approach to describe the application of shallot compress therapy in reducing body temperature in a child with fever. The intervention was administered three times, with each intervention lasting 15 minutes over a period of two days. Result: Following the application of shallot compress therapy for two days, with a frequency of three interventions lasting 15 minutes each, the child's body temperature decreased from 38.0°C to 36.9°C, with an average reduction of 0.7°C. Conclusion: The application of shallot compress therapy showed a reduction in body temperature in a preschool-aged child with fever and may be considered as a non-pharmacological nursing intervention to support fever management in children.