A cathode active material for a lithium secondary battery according to an embodiment of the present invention includes first lithium metal phosphate particles having a shape of a secondary particle formed by aggregation of primary particles and having an average particle diameter (D50) in a range from 5 µm to 10 µm, second lithium metal phosphate particles having a shape of a single particle and having an average particle diameter in a range from 1 µm to 3 µm, and third lithium metal phosphate particles having a shape of a single particle and having an average particle diameter less than 1 µm.