The residual behavior of abamectin (Vertimec 1.8 %EC), diniconazole (Sumi-eight 5% EC) methomyl (Lannate 90 %SP) and phenthoate (Cidial-L 50 % EC) in sweet bell pepper fruits under the greenhouse condition of Egypt was studied. The tested pesticides were sprayed at recommended dose of 50 ml in 100 liter water for abamectin and diniconazole per 200 m², 100 ml and50 ml in 100 liter water per 660 m²for methomyl and phenthoate respectively on pepper fruits (foliar application). The treated sweet bell pepper fruits were randomly sampled in triplicates after one hour (initial), five hour, 1, 3, 5, 7, 10, 15 and 21 days period after pesticides application including control samples one hour before application. For abamectin 1 h, 3 hour, 5 hour, then 1, 3, 6, 9, 13 and 20 days. Samples were extracted using QuEChERS method and analyzed using LC/MS/MS. The four pesticides residues dissipated during 20 days post treatment, though at a slower rate and the residues amounts in fruits were much higher in case of methomyl and phenthoate. The pre-harvest interval (PHI) was determined to be 3, 10, 21 and 21 days for pepper fruits treated with abamectin, diniconazole, methomyl and phenthoate under greenhouse conditions, respectively.