Humans that 'tame' Dragons for a living. They will either sell or keep the Dragon that they have tamed. They will incubate a Dragon Egg using approriate conditions; the Dragon will become 'stupified' and will only be able to have a knowledge if their owner releases them or if they are stolen (recovered) by a Dragon. These are usually Humans, and rarely other races.
Dragon Tamers are considered evil in the eyes of Dragons, and Dragons will kill Dragon Tamers on sight.