In the present study, lubricating grease was developed with paraffin oil and 12-lithium hydroxy stearate metal soap as a thickening agent. MoS 2 nanosheets were synthesized by hydrothermal method and functionalized with 1-octadecanethiol (i.e., MoS 2 -ODT). The MoS 2 and MoS 2 -ODT nanosheets were dispersed in the grease with different concentrations to evaluate its tribological performance. Tribological results unveiled that the addition of MoS 2 nanosheets in grease appreciably reduced the coefficient of friction and mean wear volume of tribo-interfaces as compared with pure grease. Energy dispersive spectroscopy (EDS) spectrum revealed the deposition of MoS 2 on the worn surface and confirmed a thin tribo-film which protects steel tribo-pair against wear.