4-(5-Aryl-4H-[1,2,4]triazol-3-ylmethoxy)-2Hchromen-2-ones have been synthesized by the one pot cyclocondensation reaction of 2-(2-oxo-2H-chromen-4 yloxy)acetohydrazide with aromatic/heterocyclic aldehydes in the presence of ammonium acetate in acetic acid. The structures of all the new compounds have been established on the basis of their analytical and spectral data. These compounds were also evaluated for their antibacterial and antifungal activity against various strains of bacteria and fungi and some are found to possess significant antimicrobial activity when compared with ciprofloxacin and miconazole.