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In this work, a novel series of pyridazinone derivatives (<b>3</b>–<b>17</b>) were synthesized and characterized by NMR (¹H and ¹³C), FT-IR spectroscopies, and ESI-MS methods. All synthesized compounds were screened for their antibacterial activities against <i>Staphylococcus aureus</i> (Methicillin-resistant), <i>Escherichia coli</i>, <i>Salmonella typhimurium</i>, <i>Pseudomonas aeruginosa</i>, and <i>Acinetobacter baumannii</i>. Among the series, compounds <b>7</b> and <b>13</b> were found to be active against <i>S. aureus</i> (MRSA), <i>P. aeruginosa</i>, and <i>A. baumannii</i> with the lowest MIC value range of 3.74–8.92 µM. Afterwards, DFT calculations of B3LYP/6-31++G(d,p) level were carried out to investigate geometry structures, frontier molecular orbital, molecular electrostatic potential maps, and gap energies of the synthesized compounds. In addition, the activities of these compounds against various bacterial proteins were compared with molecular-docking calculations. Finally, ADMET studies were performed to investigate the possibility of using of the target compounds as drugs.