The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material including a lithium composite metal oxide particle represented by Formula 1 below, and a secondary battery including the same. LiaNi1−x−yCoxM1yM2zM3wO2  [Formula 1] In Formula 1,M1 is a metal element whose surface energy (ΔEsurf) calculated by Equation 1 below is −0.5 eV or higher, M2 is a metal element whose surface energy (ΔEsurf) calculated by Equation 1 below is −1.5 eV or higher and less than −0.5 eV, M3 is a metal element whose surface energy (ΔEsurf) calculated by Equation 1 below is less than −1.5 eV, and 1.0≤a≤1.5, 0