The name Ansem is used to refer to several different characters in the Kingdom Hearts series:
- Terra-Xehanort, an apprentice of Ansem the Wise who stole his identity.
- His Heartless, "Ansem, Seeker of Darkness", who used Maleficent's Villains to complete the Final Keyhole.
- His Nobody "Xemnas", the leader of the original Organization XIII.
- Ansem the Wise, the original ruler of Radiant Garden.
- Riku-Ansem, who took on the heart, appearance, and name of Ansem, Seeker of Darkness.