Boss Music is used numerous times in the Kingdom Hearts series to indicate that the current battle is with a boss. Most Boss Music is fast-paced and sends a theme of evil or tension. Usually the same song would be used in different boss battles to show the connection between them, e.g. "Shrouding Dark Cloud" is mostly associated with Heartless Bosses and "Squirming Evil" is used commonly for Disney Bosses in Kingdom Hearts.
Kingdom Hearts
Awakening
- Darkside - Dive into the Heart -Destati-
Destiny Islands
- Darkside - Destiny's Force
Traverse Town
- Leon - Night of Fate
- Guard Armor - Shrouding Dark Cloud
- Opposite Armor - Destiny's Force
Wonderland
- Queen of Hearts, Card Soldiers and Crank Tower - To Our Surprise
- Trickmaster - Shrouding Dark Cloud
Olympus Coliseum
- Cloud (Story) - Shrouding Dark Cloud
- Cerberus (Story) - Squirming Evil
- Hades - Squirming Evil
- Rock Titan - The Deep End
- Ice Titan - The Deep End
- Sephiroth - One-Winged Angel (From Final Fantasy VII)
Deep Jungle
- Sabor - Having a Wild Time
- Clayton - Having a Wild Time
- Clayton with Stealth Sneak - Squirming Evil
Agrabah
- Pot Centipede - Shrouding Dark Cloud
- Cave of Wonders Guardian - Arabian Dreams
- Jafar - Squirming Evil
- Jafar (Genie) - Destiny's Force
- Kurt Zisa - The Deep End
Monstro
- Parasite Cage (1st Battle) - Shrouding Dark Cloud
- Parasite Cage (2nd Battle) - Destiny's Force
Atlantica
- Ursula - Squirming Evil
- Giant Ursula - The Deep End
Halloween Town
- Lock, Shock and Barrel - Spooks of Halloween Town
- Oogie Boogie - Squirming Evil
- Oogie's Manor - Destiny's Force
Neverland
- AntiSora - Shrouding Dark Cloud
- Captain Hook - Squirming Evil
- Phantom - Destiny's Force
Hollow Bastion
- Riku (1st Battle) - Scherzo Di Notte
- Maleficent - Squirming Evil
- Maleficent (Dragon) - The Deep End
- Riku (2nd Battle) - Forze del Male
- Behemoth - Destiny's Force
World Terminus
- Chernabog - A Night on Bald Mountain (Squirming Evil in original Japanese version)
End of the World
- Ansem, Seeker of Darkness (1st Battle) - The Deep End
- Darkside - Destiny's Force
- Ansem, Seeker of Darkness (2nd Battle) - Forze del Male
- World of Chaos - Guardando Nel Buio
Kingdom Hearts Final Mix
Hollow Bastion
- Unknown - Disappeared
Kingdom Hearts: Chain of Memories
Sora Mode
Traverse Town
- Guard Armor - Struggle Away
Wonderland
- Card Soldiers - To Our Surprise
- Trickmaster - Struggle Away
Olympus Coliseum
- Cloud - Face it! (Go for it! in PS2 remake)
- Hades - The Fight for my Friends
Agrabah
- Jafar - The Fight for my Friends
Monstro
- Parasite Cage - Struggle Away
Halloween Town
- Oogie Boogie - The Fight for my Friends
Atlantica
- Ursula - The Fight for my Friends
Neverland
- Captain Hook - The Fight for my Friends
Hollow Bastion
- Maleficent - The Fight for my Friends
Destiny Islands
- Darkside - Struggle Away
Simulated Twilight Town
- Vexen (2nd Battle) - The 13th Struggle
Castle Oblivion
- Axel (1st Battle) - The 13th Struggle
- Larxene (1st Battle) - The 13th Struggle
- Riku Replica (1st Battle) - The Force in You
- Riku Replica (2nd Battle) - The Force in You
- Vexen (1st Battle) - The 13th Struggle
- Riku Replica (3rd Battle) - The Force in You
- Riku Replica (4th Battle) - The Force in You
- Larxene (2nd Battle) - The 13th Struggle
- Axel (2nd Battle) - The 13th Struggle
- Fake Marluxia - Graceful Assassin
- Marluxia (Second Form) - Scythe of Petals
Reverse/Rebirth
Hollow Bastion
- Maleficent - The Fight for my Friends
Traverse Town
- Guard Armor - Struggle Away
Agrabah
- Jafar - The Fight for my Friends
Monstro
- Parasite Cage - Struggle Away
Neverland
- Captain Hook - The Fight for my Friends
Wonderland
- Trickmaster - Struggle Away
Olympus Coliseum
- Hades - The Fight for my Friends
Atlantica
- Ursula - Face It!
Halloween Town
- Oogie Boogie - The Fight for my Friends
Destiny Islands
- Darkside - Struggle Away
Simulated Twilight Town
- Riku Replica (2nd Battle) - The Force in You
Castle Oblivion
- Vexen - The 13th Struggle
- Riku Replica (1st Battle) - The Force in You
- Lexaeus - The 13th Struggle
- Ansem, Seeker of Darkness - Revenge of Chaos
Kingdom Hearts Re:Chain of Memories
Sora Mode
Castle Oblivion
- Marluxia (Third Form) - Lord of the Castle
Riku Mode
Destiny Islands
- Zexion - The 13th Struggle
Kingdom Hearts II
Roxas
Awakening
- Twilight Thorn - Tension Rising
Simulated Twilight Town
- Axel (1st Battle) - The 13th Struggle
- Axel (2nd Battle) - The 13th Struggle
Sora
Hollow Bastion
- Demyx (2nd Battle) - The 13th Dilemma
Radiant Garden
- Sephiroth - One Winged Angel (From Final Fantasy VII)
Land of Dragons
- Shan Yu - Vim & Vigor
- Storm Rider - The Corrupted
Beast's Castle
- Possessor/Thresholder - Dance to the Death
- The Beast - Tension Rising
- Shadow Stalker - Dance to the Death
- Dark Thorn - Desire for All That Is Lost
- Xaldin - The 13th Dilemma
Underworld
- Cerberus - Vim and Vigor
- Demyx (1st Battle) - Tension Rising
- Pete (1st Battle) - Rowdy Rumble
- Hades - The Encounter
Olympus Coliseum
- Hydra - Desire for All That Is Lost
Timeless River
- Pete (Timeless River) - Rowdy Rumble
- Pete (2nd Battle) - Rowdy Rumble
- Pete (3rd Battle) - Desire for All That Is Lost
Port Royal
- Captain Barbossa and Illuminator - Vim and Vigor
- Grim Reaper (1st Battle) - Sinister Shadows
- Grim Reaper (2nd Battle) - The Corrupted
Agrabah
- Volcanic Lord and Blizzard Lord - Desire for All That Is Lost
- Jafar - The Encounter
Halloween Town
- Prison Keeper and Lock, Shock and Barrel - Dance to the Death
Christmas Town
- Oogie Boogie - The Encounter
- Lock, Shock and Barrel - Rowdy Rumble
- The Experiment - The Corrupted
Pride Lands
- Shenzi, Banzai, and Ed (1st Battle) - Rowdy Rumble
- Scar - The Encounter
- Shenzi, Banzai, and Ed (2nd Battle) - Rowdy Rumble
- Groundshaker - The Corrupted
Space Paranoids
- Hostile Program - The Corrupted
- Sark - Sinister Shadows
Castle that Never Was
- Xigbar - The 13th Dilemma
- Luxord - The 13th Struggle
- Saïx - The 13th Dilemma
- Xemnas - Disappeared
- Xemnas (Dragon) - Fight to the Death
- Xemnas (Dragon) (2nd Battle) - Darkness of the Unknown
- Xemnas (Final) - Darkness of the Unknown
Kingdom Hearts
- Xemnas (Armor) (1st Battle) - A Fight to the Death
Kingdom Hearts II Final Mix
Keyblade Graveyard
- Lingering Will - Rage Awakened
Cavern of Remembrance
- Roxas Data - The Other Promise
- Larxene Data - The 13th Reflection
- Marluxia Data - The 13th Reflection
- Luxord Data - The 13th Struggle
- Demyx Data - The 13th Dilemma
- Axel Data - The 13th Struggle
- Saïx Data - The 13th Dilemma
- Zexion Data - The 13th Reflection
- Lexaeus Data - The 13th Reflection
- Vexen Data and AntiForm - The 13th Reflection
- Xaldin Data - The 13th Dilemma
- Xigbar Data - The 13th Dilemma
- Xemnas Data - Disappeared
- Final Data - Darkness of the Unknown
The World that Never Was
- Roxas - The Other Promise
Agrabah
- Vexen's Absent Silhouette and Anti Form - The 13th Reflection
Twilight Town
- Lexaeus's Absent Silhouette - The 13th Reflection
Underworld
- Zexion's Absent Silhouette - The 13th Reflection
Beast's Castle
- Marluxia's Absent Silhouette - The 13th Reflection
Port Royal
- Larxene's Absent Silhouette - The 13th Reflection
Kingdom Hearts 358/2 Days
Twilight Town
- Guardian - (title unannounced)
- Veil Lizard - (title unannounced)
- Tailbunker - (title unannounced)
- Darkside - (title unannounced)
- Powered Armor - (title unannounced)
- Dustflier - (title unannounced)
- Xion: Final Form - Vector to the Heavens
Agrabah
Beast's Castle
- Dark Follower - (title unannounced)
- Infernal Engine - (title unannounced)
Olympus Coliseum
- Morning Star - (title unannounced)
- Xigbar - (title unannounced)
- Guard Armor - (title unannounced)
Wonderland
- Lurk Lizard - (title unannounced)
- Crimson Pranksters - (title unannounced)
- Xion: First Form - (title unannounced)
Neverland
- Wavecrest - (title unannounced)
- Ruler of the Sky - (title unannounced)
Halloween Town
- Leechgrave - (title unannounced)
- Xion: Second Form - (title unannounced)
- Lock, Shock and Barrel- (title unannounced)
Castle That Never Was
- Saïx - Critical Drive
The World That Never Was
- Riku - (title unannounced)
Kingdom Hearts Birth by Sleep
Land of Departure
- Master Eraqus - Terra
- Unknown - Dark Impetus
Enchanted Dominion
- Maleficent - (title unannounced)
- Maleficent (Dragon) - (title unannounced)
- Wheel Master - The Tumbling
Dwarf Woodlands
- Magic Mirror - (title unannounced)
- Mad Treant - Unforgettable
Castle of Dreams
- Symphony Master - The Tumbling
- Lucifer - (title unannounced)
- Cursed Coach - Extreme Encounters
Radiant Garden
- Trinity Armor - Unforgettable
- Braig - Black Powder
- Terra-Xehanort (Last Episode) - Dismiss
- Vanitas - Enter the Darkness
Olympus Coliseum
- Hades and Ice Colossus - (title unannounced)
- Zack - (title unannounced)/Extreme Encounters
Deep Space
- Experiment 221 - (title unannounced)
- Gantu - (title unannounced)
- Metamorphosis - The Tumbling
Neverland
- Peter Pan - (title unannounced)
- Captain Hook - (title unannounced)
- Vanitas - Enter the Darkness
Keyblade Graveyard
- Master Xehanort and Vanitas - Black Powder
- Master Xehanort - Black Powder
- Terra-Xehanort - Rage Awakened -The Origin-
- Braig - (title unannounced)
- Vanitas - Enter the Darkness/Unbreakable Chains
- Ventus-Vanitas - (title unannounced)
- Vanitas Remnant - Enter the Void