This article is a list of bosses that are fought in the Metal Gear series.
Metal Gear
These are the bosses in Metal Gear. Alternate bosses featured in the the Nintendo Entertainment System version are noted alongside their MSX2 version counterparts.

Boss characters in Metal Gear.
- Mercenaries (4; not featured in the NES version)
- Shotmaker
- Machinegun Kid
- Hind D/Twin Shot
- Tank
- Bull Tank
- Fire Trooper
- Bloody Brad (2)
- Dirty Duck
- Metal Gear/Supercomputer
- Big Boss/Big Boss (NES)
Metal Gear 2: Solid Snake
- Black Ninja
- Running Man
- Hind D
- Red Blaster
- Four Horsemen
- Jungle Evil
- Night Fright
- Drago Pettrovich Madnar
- Metal Gear D (piloted by Gray Fox)
- Gray Fox
- Big Boss
- Mercenaries (miniboss (while escaping with Holly White))
Metal Gear Solid

Boss characters in Metal Gear Solid.
Disc 1:
- Heavily armed Genome Soldiers (miniboss)
- Revolver Ocelot
- Tank (controlled by Vulcan Raven and two Genome Soldiers)
- Cyborg Ninja
- Psycho Mantis
- Sniper Wolf (Underground Passage)
- Black-outfitted Genome Soldiers (3; miniboss)
- Hind D (piloted by Liquid Snake, co-piloted by a Genome Soldier)
- Stealth Camouflaged Genome Soldiers (4; miniboss)
- Sniper Wolf (Snowfield)
Disc 2:
- Black-outfitted Genome Soldiers (3 in the PlayStation version, 4 in The Twin Snakes; miniboss)
- Vulcan Raven
- Metal Gear REX (piloted by Liquid Snake)
- Liquid Snake (on top of Metal Gear REX)
- Liquid Snake (escape route)
Metal Gear Solid 2: Sons of Liberty

Boss characters in Metal Gear Solid 2.
Tanker Chapter:
- Olga Gurlukovich
- Gurlukovich Mercenaries (miniboss)
Plant Chapter:
- Fortune (miniboss)
- Fatman
- Harrier (piloted by Solidus Snake, co-piloted by Vamp)
- Vamp (Filtration Chamber No. 1)
- Vamp (Oil Fence; miniboss)
- Tengus (miniboss)
- Metal Gear RAY units (AI controlled)
- Solidus Snake
Metal Gear Solid 3: Snake Eater

Boss characters in Metal Gear Solid 3.
- Ocelot Unit (miniboss)
- Ocelot
- The Pain
- The Fear
- The End (if The End was killed earlier on, he is replaced by members of the Ocelot Unit)
- The Fury
- The Sorrow
- Ocelot Unit (3; miniboss; if Snake did not remove the transmitter implanted by Ocelot after the torture sequence)
- Yevgeny Borisovitch Volgin
- Shagohod (piloted by Volgin)
- The Boss
Metal Gear Solid: Portable Ops
- Python
- Null (Silo Entrance)
- Metal Gear RAXA (piloted by Ursula)
- Null (Power Substation)
- Cunningham (piloting a flying platform)
- Gene
Metal Gear Solid 4: Guns of the Patriots

Boss characters in Metal Gear Solid 4.
Act 1: Liquid Sun
- FROGS (Advent Palace; miniboss)
Act 2: Solid Sun
- FROGS (Naomi's Lab; miniboss)
- Laughing Octopus
Act 3: Third Sun
Act 4: Twin Sun
- Crying Wolf
- Vamp
- Suicide Gekko (miniboss)
- Metal Gear RAY (piloted by Liquid Ocelot; Snake counters by controlling Metal Gear REX)
Act 5: Old Sun
- FROGS (Command Center; miniboss)
- Screaming Mantis
- Liquid Ocelot
Metal Gear Solid: Peace Walker

Bosses in Peace Walker.
Main Ops
Chapter 1: A Country Without An Army
Chapter 2: The Phantom Hero
Chapter 3: A Nation Reborn
- Peace Sentinel Commandos (24)
- Cocoon
- Peace Walker (bipedal; Mining Pit)
Chapter 4: The Illusion of Peace
- Mi-24D (miniboss)
- Peace Walker (quadrupedal; Runway)
Chapter 5: Outer Heaven
- Metal Gear ZEKE (piloted by Pacifica Ocean)
Extra Ops
- BTR-60 PA (Extra Op #69)
- BTR-60 PA Custom (Extra Op #70)
- BTR-60 PB (Extra Op #71)
- BTR-60 PB Custom (Extra Op #72)
- LAV - Type G Custom (Extra Op #73)
- LAV - Type C (Extra Op #74)
- LAV - Type C Custom (Extra Op #75)
- T-72U (Extra Op #76)
- T-72U Custom (Extra Op #77)
- T-72A (Extra Op #78)
- T-72A Custom (Extra Op #79)
- KPz 70 (Extra Op #80)
- KPz 70 Custom (Extra Op #81)
- MBTk-70 (Extra Op #82)
- MBTk-70 Custom (Extra Op #83)
- Mi-24A (Extra Op #84)
- Mi-24A Custom (Extra Op #85)
- Mi-24D (Extra Op #86)
- Mi-24D Custom (Extra Op #87)
- AH56A-Bomber (Extra Op #88)
- AH56A-Bomber Custom (Extra #Op 89)
- AH56A-Raider (Extra Op #90)
- AH56A-Raider Custom (Extra #Op 91)
- T-72U Custom (Extra Op #92)
- T-72A (Extra Op #93)
- T-72A Custom (Extra Op #94)
- KPz-70 (Extra Op #95)
- KPz-70 Custom (Extra Op #96)
- MBTk-70 (Extra Op #97)
- MBTk-70 Custom (Extra Op #98)
- BTR-60 PA (Extra Op #99)
- BTR-60 PA Custom (Extra Op #100)
- BTR-60 PB (Extra Op #101)
- BTR-60 PB Custom (Extra Op #102)
- LAV-Type G (Extra Op #103)
- LAV-Type G Custom (Extra Op #104)
- Mi-24A Custom (Extra Op #105)
- Mi-24D (Extra Op #106)
- Mi-24D Custom (Extra Op #107)
- AH56A Bomber (Extra Op #108)
- AH56A Bomber Custom (Extra Op #109)
- AM56A Raider (Extra Op #110)
- AM56A Custom (Extra Op #111)
- Pupa Type 2 (Extra Op #112)
- Pupa Custom (Extra Op #113)
- Chrysalis Type 2 (Extra Op #114)
- Chrysalis Custom (Extra Op #115)
- Cocoon Type 2 (Extra Op #116)
- Cocoon Custom (Extra Op #117)
- Peace Walker Type 2 (Extra Op #118)
- Peace Walker Custom (Extra Op #119)
- Metal Gear ZEKE (AI Controlled; Extra Op #120)
Monster Ops
These are secret bosses originating from/inspired by the Monster Hunter Series
- Rathalos (Extra Op #121)
- Rathalos (Twilight) (Extra Op #122)
- Tigrex (Extra Op #123)
- Tigrex (Twilight) (Extra Op #124)
- Gear Rex (Isla del Monstruo; Extra Op #125)
- Gear Rex (Twilight) (Extra Op #126)
- Gear Rex (Crater Base; Extra Op #127)
- Gear Rex (Mother Base; Extra Op #128)
Metal Gear Rising: Revengeance
Main game
- Metal Gear RAY Mod. (Port)
- Metal Gear RAY Mod. (Rooftops/Tower)
- Samuel Rodrigues (Train)
- LQ-84i
- Hammerhead
- Mistral
- Grad (Mexico)
- Monsoon
- Grad (World Marshal HQ)
- Body double Mistral (AI controlled)
- Body double Monsoon (AI controlled)
- Sundowner
- Samuel Rodrigues (Badlands)
- Metal Gear EXCELSUS (piloted by Steven Armstrong)
- Steven Armstrong
Jetstream DLC
Blade Wolf DLC
Metal Gear Solid V: Ground Zeroes
Side Ops
- Armored vehicle (Intel Operative Rescue)
- Helicopter (Intel Operative Rescue)
- Armored vehicle (Destroy the Anti-Air Emplacements)
Extra Ops
- Helicopter (Jamais Vu)
Metal Gear Solid V: The Phantom Pain
- Man on Fire (controlled by Tretij Rebenok; horseback)
- Parasite Unit (Mist)
- Quiet
- Metal Gear Sahelanthropus (controlled by Tretij Rebenok)
- Parasite Unit (Armor)
- Man on Fire (controlled by Tretij Rebenok)
- Eli
- Female Parasite Unit (Camo)
- Parasite Unit (Armor)
- Metal Gear Sahelanthropus (controlled by Eli and Tretij Rebenok)
Side Ops
- Eli
Snake's Revenge
All bosses in this game are unnamed with the exception of Big Boss (who fights in two forms) and Metal Gear 2. Bosses are as follows:
- The five mercenaries
- The three grenadiers
- The two train ambushers
- The John Turner impersonator
- Tank
- Big Boss
- Big Boss (cyborg)
- Metal Gear 2
Metal Gear: Ghost Babel
Boss characters in Ghost Babel.
- Slasher Hawk
- Marionette Owl
- Pyro Bison
- Mil Mi-28 Havoc (piloted by Sophie N'dram, co-piloted by a GLF soldier)
- Black Arts Viper
- Metal Gear GANDER (piloted by Augustine Eguabon)
- Black Arts Viper (rematch)
Metal Gear Acid
- Fake William Flemming
- Leone
- Teliko Friedman
- Leone
- La Clown
- Metal Gear KODOQUE (piloted by William Flemming)
Metal Gear Acid 2
- Harab Serap
- Vince
- Golab
- Metal Gear KODOQUE
- Chaigidiel
- Vince
- Metal Gear Chaioth Ha Qadesh (piloted by Thomas Koppelthorn)
- Metal Gear Chaioth Ha Qadesh (piloted by Lucy)
- Venus
Metal Gear Solid Mobile
Snake Tales
A Wrongdoing
Big Shell Evil
- Harrier (piloted by two Russian crime syndicate members)
Confidential Legacy
- Gurlukovich Mercenaries (miniboss)
- Meryl Silverburgh
Dead Man Whisper
External Gazer
- Gurlugon
- Metal Gear RAY units (AI controlled)
- Solidus Snake
Metal Gear Survive
- Wanderer-Seth
- Lord of Dust
- Big Mouth (optional)
- Frost (optional)