Dihydropyrimidinones are therapeutically important class of compounds. The reported work reveals the synthesis of some novel substituted dihydropyrimidinones and their evaluation for in vitro antibacterial activity and in vitro antifungal activity. Dihydropyrimidinones were synthesized through Biginelli reaction and tested against gram positive bacteria such as Staphylococcus aureus, Bacillus subtilis and gram negative bacteria such as Escherichia coli and Salmonella paratyphi. All the compounds were found to exhibit a moderate antibacterial activity and antifungal activity against the tested microorganisms. Compound DC-1 and DC-3 exhibited significant activity against S.paratyphi and B.subtilis respectively. Compound DC-4 exhibited stronger inhibition against A.niger.