Glinn Daro was a Cardassian officer who served aboard the Galor-class warship Trager under Gul Macet during the mid-2360s.
In 2367, he accompanied Macet aboard the USS Enterprise-D as part of the observation team in the pursuit of USS Phoenix. While on board, Daro attempted to speak to Miles O'Brien concerning the pattern buffers used in the Enterprise-D's transporter system, but was initially refused.
Later, he shared a drink of kanar with O'Brien in Ten Forward, where O'Brien spoke of his experience at the Setlik III massacre, something Daro described as "a terrible mistake". (TNG: "The Wounded")