Gul Macet is a Cardassian officer in the Star Trek universe, specifically appearing in The Next Generation episode "The Wounded."
Macet was the first Cardassian seen in the Star Trek saga and the only Cardassian to ever appear with facial hair. His onscreen reveal was described in the episode's script as "A Cardassian Gul (Captain) appears. These are humanoid aliens -- sleek, handsome, intense."
Macet was played by Star Trek veteran Marc Alaimo, who would later play a much more famous Cardassian, Gul Dukat.