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The effects of Citrus sinensis peel extracts in ethanol and n-hexane on housefly and mosquito larvae were investigated in this study. Larval mortality rose as concentrations between 50 and 400 ppm increased over the course of 48 hours. The ethanolic extract contained alkaloids, tannins, phenolics, flavonoids, steroids, cardiac glycosides, and saponins whereas terpenoids, steroids, saponins, and flavonoids were primarily found in the n-hexane extract. With (LC₅₀: 4.94 ppm for housefly larvae and 6.82 ppm for mosquito larvae; LT₅₀: 9.86 h for housefly larvae and 12 h for mosquito larvae) for n-hexane and (LC₅₀: 7.84 ppm for housefly larvae and 9.17 ppm for mosquito larvae; LT₅₀: 14.76 h for housefly larvae and 15.43 h for mosquito larvae), n-hexane was more effective than ethanol. Although not as effective as a commercial insecticide, both extracts exhibited good natural larvicidal efficacy.