The name Twilight is used to refer to several different concepts in the Kingdom Hearts series:
- The Twilight Town world, where Roxas was born, and its simulated replica.
- The Twilight Thorn Nobody from Kingdom Hearts II.
- The white material type from Kingdom Hearts II.
- The form Saïx's claymore takes when equipped with the Fearless Gear.
- The form Roxas's Keyblade takes when equipped with the Ultimate Gear.
- The Realm of Nothingness, sometimes known as the Realm of Twilight.