The present invention provides a light guide plate capable of improving brightness uniformity and a backlight unit having the same. The present invention also provides a liquid crystal display having such light guide plate and backlight unit. The light guide plate according to the present invention has a light incidence and a light emitting surface, wherein the light incidence surface is not perpendicular to the light emitting surface. The present invention utilizes the light guide plate capable of improving brightness uniformity across the light emitting surface so that the backlight unit and liquid crystal display may have considerably improved brightness uniformity.