The high cycle fatigue (HCF) strength of Cu-Ti alloys of four compositions viz. Cu-1.5 wt% Ti, Cu-2.7 wt% Ti, Cu-4.5 wt% Ti and Cu-5.4 wt% Ti, has been investigated in solution treated as well as peak aged conditions. The fatigue strength was found to increase from 108 MPa for the solution treated Cu-1.5 Ti, to 295 MPa, for the peak aged Cu-5.4 Ti alloy. Though the fatigue ratio did not vary with Ti content in peak aged condition, it was slightly higher for low Ti alloys (1.5 and 2.7 Ti) than the high Ti containing ones in the solution treated state. The fatigue strength and resilience of Cu-Ti alloys are comparable with those of the commercial Cu-2Be-0.5 Co alloys as well as the annealed 0.75% carbon steels. Basquin equation is followed by these alloys.