The following is a list of Bosses that appear in Oracle of Ages.
Giant Ghini • Spirit's Grave
Swoop • Wing Dungeon
Subterror • Moonlit Grotto
Armos Warrior • Skull Dungeon
Great Moblin • Great Moblin's Keep
Smasher • Crown Dungeon
Vire • Mermaid's Cave
Angler Fish • Jabu-Jabu's Belly
Blue Stalfos • Ancient Tomb
Pumpkin Head • Spirit's Grave
Head Thwomp • Wing Dungeon
Shadow Hag • Moonlit Grotto
Eyesoar • Skull Dungeon
Smog • Crown Dungeon
Octogon • Mermaid's Cave
Possessed Nayru • Ambi's Palace
Plasmarine • Jabu-Jabu's Belly
Ramrock • Ancient Tomb
Veran • Black Tower
Twinrova • Room of Rites
Ganon • Room of Rites