In the present study, 2,5‐bis(mercapto‐acetichydrazide)‐1,3,4‐thiadiazole (1) was utilized by different reagents, namely, ethoxymethylene malononitrile, ethoxymethylene ethyl cyanoacetate, triethyl orthoformate, phenyl isothiocyanate, carbon disulfide, isatin, acetophenone, cyclohexanone, different aldehydes, and different anhydrides, to yield a new series of 2,5‐disubstituted‐1,3,4‐thiadiazoles 2–18. The chemical structure of these products was characterized by the spectral data IR, 1H‐NMR, 13C‐NMR, MS, and elemental analysis. All the synthesized compounds were screened for their antibacterial activity.