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In this study, addition of both nano-SiO₂ (NS), nano-Al₂O₃ (NA) and nano-Fe₂O₃ (NF) powders and their binary and ternary combinations on the compressive strength and capillary water absorption of cement mortars containing fly ash (FA) were investigated. Powder amounts were used at ratios corresponding to 0.5wt%, 1.25wt% and 2.5wt% of the binder for all mixtures. Results show that addition of any single type of oxide powders at 1.25% increased compressive strength of the mortars much further than the other proportions. The use of NS+NA powders at 1.25% improved the compressive strength by the most compared to the control specimen. For all binary powder combinations, the rate of increase in strength reached generally their peak on the 28th day and gradually decreased through aging. Among all groups, the best results were obtained from the mortars added with NS+NA+NF powders at 1.25%. For …