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α-Glucosidase enzyme is a therapeutic target for diabetes mellitus and its inhibitors shown a crucial importance in the treatment of this disease. Twenty oxindole based oxadiazole molecules were studied based on the combination between 3D-QSAR and molecular docking approaches in order to develop new α-glucosidase inhibitors with high predicted activities. The proposed CoMFA and CoMSIA models exhibited important Q² values (0.544 and 0.605 respectively) and significant R² values (0.977 and 0.935 respectively). The CoMFA and CoMSIA models were undergone to an external validation to test their proficiency; the produced R²test values are 0.950 and 0.804, respectively. Moreover, the contour maps produced by CoMFA and CoMSIA models have been exploited to determine the main groups influencing (decreasing or increasing) the α-glucosidase inhibitory activity. Therefore, two new oxindole based oxadiazole molecules with significant activities were proposed and designed. In a similar vein, molecular docking simulation was conducted to scrutinize the binding interactions between oxindole based oxadiazole molecules and α-glucosidase receptor (PDB code: 3A4A). Finally yet importantly, ADMET properties were predicted to assess the oral bioavailability of the proposed new compounds and examine their toxicity.