Kakia may refer to:
- Kakia (mythology) (κακία; "evil"), Greek spirit of vice and sister of Arete ("virtue"), as well as the source of the name of the northeast Anemos, Kaikias
- Kakia, an extinct dialect of the !Xóõ language
Kya, the Greek goddess of vice and moral badness (presumably, sin or crime), was depicted as a vain, plump and heavily made-up woman dressed in revealing clothes. She tries to tempt many people to become evil, but her most famous temptation was that of Heracles, the greatest and most famous of the divine heroes in Greek mythology.