A laser irradiation apparatus includes a laser light source which emits a laser beam, a first lens through which the laser beam emitted from the laser light source passes, a first scanner which reflects the laser beam passing through the first lens and changes a direction of the laser beam, a second scanner which reflects the laser beam deflected by the first scanner and changes a direction of the laser beam, a plurality of second lenses through which the laser beam deflected by the second scanner passes, where at least one of the plurality of second lenses is configured to vibrate in one direction, and an optical element through which the laser beam passing through the plurality of second lenses passes, where the optical element is configured to correct an incident angle of the laser beam incident a substrate.