This paper investigates the influence of heat treatment on rolling contact fatigue (RCF) performances of Laser Powder Bed Fusion (L-PBF) processed IN718 alloy. The cylindrical specimens (Ø9.5 mm) produced with optimised parameters are subjected to RCF testing under boundary lubrication conditions. RCF results show that improved performance about 40% after heat treatment is due to the restoration of strengthening precipitates. The improved bulk hardness by 27% resulted in RCF life enhancement by 2.5 folds. From sub-surface analysis, it was found that the L-PBF produced specimens seen to be more prone to trans/inter-track and interlayer crackings than conventional wrought IN718 alloy, which predominantly showed intergranular and transgranular cracks.