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A series of new nickel (II) and copper (II) hydrazone complexes\textbf {1--14}, containing a bidentate NO-donor hydrazone ligand, derived from 4-nitrobenzoylhydrazide and several aliphatic and aromatic aldehydes were synthesized, and their chemical structures were confirmed by means of FT-IR, UV-Vis, H and C NMR, mass spectral data, conductance measurements, and elemental analyses. The spectral data of the newly synthesized complexes show the formation of a 1: 2 [metal: ligand] ratio. The ligands and their complexes were also investigated for their possible in vitro antimicrobial activities against\textit {S. aureus},\textit {S. epidermidis},\textit {E. coli},\textit {K. pneumonia},\textit {P. aeruginosa},\textit {P. mirabilis},\textit {E. faecalis}, and\textit {C. albicans}. Among the fourteen new complexes synthesized, complex Cu (L (\textbf {7}) containing a direct aromatic moiety in the ligand (HL was found to be most active against selected test microorganisms.