Dengue Hemorrhagic Fever (DHF) or Hemorrhagic Fever (HF) is a disease caused by the Dengue virus, transmitted through the bites of Aedes aegypti L and Aedes albopictus mosquitoes. Both types of mosquitoes are found in almost all corners of Indonesia. One way to avoid these mosquitoes is to use natural repellents with a repelling or killing effect. The purpose of this study was to analyze the repellent efficacy of Bischofia javanica leaf extract lotion against A. aegypti L mosquitoes. The method used was an experiment based on the procedure recommended by the World Health Organization Pesticides Evaluation Scheme. Leaf samples of B. javanica were extracted by maceration. The test for the extract lotion was carried out on the organoleptic parameters, homogeneity, pH, centrifugation, patch test, spreadability, adhesion, and effectiveness as a repellent. The results showed that the 50 percent concentration of B. javanica leaf extract lotion had 100 percent protection power (at the 1st to the 2nd hour). However, after 5 hours, the protection power decreased to 83.21 percent.