Nineteen N'-(benzylidene)-2-[(pyrimidin-2-yl)thio]acetohydrazides were obtained via the nucleophilic addition- elimination reaction of 2-[(pyrimidin-2-yl)thio)]acetohydrazide with aromatic aldehydes. The synthesized compounds were tested in vitro against various bacteria by microdilution. Among these compounds, N'-(3- hydroxybenzylidene)-2-[(pyrimidin-2-yl)thio]acetohydrazide (3l) was found to be the