Poor tribological properties of titanium and its alloys directed many researchers to explore novel surface modifications and coatings to improve wear resistance. In this paper, effect of alumina nano particles on friction and wear behavior of electroless Ni-P-Al 2 O 3 nanocomposite coating on commercially pure titanium substrate has been investigated. For this purpose, electroless Ni-P and Ni-P-Al 2 O 3 coatings were deposited on CP-Ti substrate and then heat treated at 400 ?C for 1 h. Wear resistance and friction of coatings were evaluated by the pin on disc method. Morphology and composition of worn surfaces were studied by scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS). Also, phase transformation and microstructural changes were studied by X-ray diffraction (XRD) analysis. The results showed that the incorporation of alumina nano particles in the Ni–P matrix increased hardness and wear resistance of the deposits. It was also determined that heat treated coatings at 400?C for 1h, as compared with as-plated samples, have higher hardness and wear resistance. Heat treated nanocomposite coating exhibited highest coefficient of friction. Keywords: CP-Ti, Electroless Ni-P-Al 2 O 3 , Nanocomposite coating, Wear resistance