A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, and a liquid crystal layer between the first and second substrates. The liquid crystal layer includes a liquid crystal composition including an alkenyl liquid crystal and an antioxidant component including at least one selected from an antioxidant and a derivative thereof. In an embodiment, the antioxidant component is present in an amount of greater than 0 ppm and equal to or less than about 10,000 ppm relative to the total weight of the liquid crystal composition.