卡达西人（英语：Cardassians）是《星际旅行》虚构宇宙中的一个种族。他们主要出现在《下一代》、《深空九号》及《航海家号》中。卡达西人的母星是第一象限的卡达西主星。这个种族性格骄傲但狡诈凶残，曾经占领贝久星数十年之久。他们外表呈现地球鱼类的特征，船舰设计也采用类似鱼骨型并附有鱼鳍的设计。 深空九号星站原本为卡达西人所建。

The Cardassians are an extraterrestrial species in the Star Trek science fiction franchise. First introduced in the 1991 Star Trek: The Next Generation episode, "The Wounded", the species originated on the fictional Alpha Quadrant planet, Cardassia Prime. Cardassians were the dominant species in an interstellar empire known as the Cardassian Union during the 24th century, although they are not confirmed to have ruled any other species aside from, for fifty years, the Bajorans. The Cardassians later played a key role in the storyline of the Star Trek: Deep Space Nine series as allies of the Dominion in the Dominion War. Several Cardassian characters, including Elim Garak and Gul Dukat, are prominently featured.