An electrode active material, a method of preparing the electrode active material, an electrode including the electrode active material, and a lithium secondary battery including the electrode; the electrode active material comprising a core active material; and a coating layer formed on a surface of the core active material, wherein the coating layer comprises a composition including a compound represented by Formula 1 below and a carbonaceous material, or a first coating layer including a carbonaceous material and a second coating layer including the compound represented by Formula 1 below: LixMy(PO4)z,  Formula 1 where M is selected from the group consisting of alkali metal, alkaline earth metal, a group 13 element, a group 14 element, a transition metal, a rare earth element, and combinations thereof; 1≦x≦3, 0≦y≦3, and 1≦z≦3.