''Lestes dryas'' is a species of damselfly which is found across Europe, Asia and North America. In North America it is known as the emerald spreadwing and this name is becoming more widely used in Europe. In Britain, it is very rare so its common name is the scarce emerald damselfly. An alternate name in Ireland is the turlough spreadwing.
''L. dryas'' can tolerate extreme conditions that few other dragonflies can survive.