The term Dark can refer to several different concepts in the Kingdom Hearts series:

• Darkness, a primal force associated with the heart.
  • The Realm of Darkness, a realm composed of that force.
  • The Door to Darkness, a door between the realms of light and darkness.
  • The Dark Margin between the Realm of Darkness and the Realm Between.
  • The Dark Corridors used to move between these realms.
  • Kingdom Key D, the Keyblade belonging to the Realm of Darkness.
• The Portal of Darkness areas within the World of Chaos.
• The "Dark Depths" area of Radiant Garden.
• The Darkside Heartless from Kingdom Hearts.
• The Dark Thorn, a stronger form of the Shadow Stalker Heartless from Kingdom Hearts II.
• The Dark Follower Heartless from Kingdom Hearts 358/2 Days.
• The black material type from Kingdom Hearts II.
• The Dark Matter synthesis material from Kingdom Hearts Final Mix.
• The Dark Ring accessory from Kingdom Hearts.
• The Dark Anklet accessory from Kingdom Hearts II.
• The "Darker Than Dark" form Roxas's Keyblade takes when equipped with the Hazard Gear.
• The "Dark Mode" form Riku takes when channeling the power of darkness.
• Light & Dark, the ability granted by the Two Become One Keyblade.
• Dark Aura, Riku's most powerful ability.
• Dark Firaga, a magic ability used by Riku and Terra.

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