List of Bosses in Borderlands 2, Alphabetically:

Bad Maw (Three Horns Valley)

Black Queen (The Dust)

Blue (Caustic Caverns) You could also kill the Creepers while you're here.

BNK3R (Thousand Cuts > The Bunker)

Boll (Three Horns Divide)

Bonehead 2.0 (Arid Nexus Badlands)

Boom & Bewm (Southern Shelf)

Captain Flynt (Southern Shelf)

DJ Hunter Hellquist (Arid Nexus Boneyard)

Doc Mercy (Three Horns Valley)

Donkey Mong (Eridium Blight)

Dukino's Mom (Lynchwood)

Foreman (Opportunity)

Gettle (The Dust)

Henry (The Highlands)

Incinerator Clayton (Frostburn Canyon)

King Mong (Eridium Blight)

Knuckle Dragger (Windshear Waste)

Laney White (The Fridge)

Mad Dog (Lynchwood)

Mad Mike (Bloodshot Stronghold)

Madam Vons Bartlesby (Tundra Express)

McNally (The Dust)

Midgemong / Warmong (Southern Shelf Bay)

Mobley (The Dust)

Old Slappy (Highlands Outwash)

Pimon (Wildlife Exploitation Preserve)

Rakk Man (The Fridge)

Saturn (Arid Nexus Badlands)

Scorch (Frostburn Canyon)

Smash Head (The Fridge)

Son of Mothrakk (Wildlife Exploitation Preserve)

Spycho (Frostburn Canyon)

Terramorphous (Terramorphous Peak)

The Assassins: (Southpaw Steam & Power)





The Warrior (Vault of the Warrior)

Tumba (Wildlife Exploitation Preserve)

Vermivorous the Invincible

W4R-D3N (Bloodshot Ramparts)

Wilhelm (End of the Line)]