A non-aqueous electrolyte solution and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes an organic solvent containing cyclic carbonate, dimethyl carbonate, and a nitrile-based solvent represented by Formula 1, and a lithium salt: R—CN  [Formula 1] wherein, in Formula 1, R is an alkyl group having 3 to 10 carbon atoms or an alkenyl group having 3 to 10 carbon atoms.