Calassia

Calassia or Calassian may refer to:


 * Calassia (empress), a powerful interstellar monarch
 * Calassian Dominion (also known simply as "Calassia"), the empire she rules over
 * Calassianism (also known as "Calassia Thought"), the philosophy derived from the empress' beliefs
 * Calassian race, the superior race as idealized by Calassianists