A synergistic microbicidal composition containing synergistic combinations of a phenolic compound selected the class consisting of chlorinated phenols, monosubstituted phenols, fused bicyclic phenols, isopropyl methyl catechols and monosubstituted catechols and an antimicrobial alcohol selected from the class consisting of propen-2yl-methyl-cyclohexanols, menthadiene alcohols and substituted cyclohexyl propyl-1,3-diols.