A nonaqueous electrolyte for a lithium secondary battery, the nonaqueous electrolyte including: a fluorine-containing lithium salt, an organic solvent, and an organosilicon compound represented by Formula 1: wherein, in Formula 1, R1 to R6 are each independently a C1-C10 alkyl group or a C1-C10 alkoxy group. Also a lithium secondary battery including the nonaqueous electrolyte.