The present invention discloses an insect repellent aqueous formulation comprising a combination of at least two essential oils, neem oil containing Azadirachtin as the main component and camphor(1,7,7-Trimethylbicyclo[2.2.1]heptan-2-one). The formulation contains 15-35percent by weight neem oil and 65-85 percent by weight camphor.