The White Dragon is a dragon species from the How to Train Your Dragon book series. One is ridden by Humongously Hotshot the Hero in How to Twist a Dragon's Tale. It is pure white and has one horn on the middle of its forehead. Not much else is known about White Dragons, and only a partial picture was drawn by the author (seen at right).
Because most riding dragons are classified as Sky Dragons, it can be presumed White Dragons are, too.