Some new tellurium (IV) complexes with a tridentate Schiff base formed by condensation of isatin with 2- aminothiophenol having formulae TeCl3(HIATP), Te(IATP)2, RTeCl2(HIATP) and R2TeCl(HIATP), where R = pmethoxy-, p-hydroxy- and 3-methyl-4-hydroxyphenyl and H2IATP = Schiff base, have been synthesized and characterized by elemental analyses, conductance measurement, IR and 1H NMR spectral studies. The data predict that Schiff base acts as a monobasic tridentate (ONS)ligand in TeCl3(HIATP), RTeCl2(HIATP), R2TeCl(HIATP) and as a dibasic tridentate (ONS) ligand in Te(IATP)2. Some of these complexes have been observed to possess antifungal and antitubercular activity.