Abstract: The purpose of the research is to evaluate the properties of High Performance Mortars (HPMs) produced from Metakaolin (MK) and Waste Marble Dust (WMD) as a partial substitution to Ordinary Portland Cement (OPC) in binary and ternary cementitious mixtures. For this scope, the water/binder ratio utilised to prepare the mortar was 0.30 with a binder content of 640 kg/m³ totally and a cementitious/sand ratio of 1:2.25. The control mix was prepared from OPC only as the binder while the other mixes consisted of cement replaced with MK up to 10% and WMD up to 20% in binary and ternary mixtures. The workability of fresh HPMs was tested using flow table and slump tests. The compressive strength of the hardened mortars was tested at curing of 3, 7, 28, 56 and 90 days while unit weight and the flexural tensile strength tests were conducted at 28 days. The results indicated that the slump and flow values were gradually decreased for all the binary and ternary mortars blends with increasing the replacement levels of MK and WMD. In addition, the compressive strength decreased generally for all the binary mortars mixtures at 3, 7 days and more, mortars mixtures with the replacement of 10 and 20% of MK and 10% WMD gave the best results from than control mortar, except for the 20% WMD, mortar which decreased from the control for all curing ages. The compressive strength of the mortar mixtures in ternary mortars blends at 28 days were better than that of the control mortar and binary blends systems for the same replacement levels. Moreover, 10% MK and 10% WMD caused a increases in flexural tensile strength of the mortars in the binary and ternary blending mixtures at curing of 28 days.