Iron Man has a large range of villains. They each have specific abilities which they use against Tony Stark. While these enemies include major independent operators such as Mandarin and Doctor Doom, many of the more minor villains, especially those equipped with extremely advanced weaponry, are mercenaries of Justin Hammer. This is a list of them:
Blizzard - A costumed villain with a suit that enables him to produce ice and cold and a former Stark employee who was fired for robbery. Originally called Jack Frost.
Blacklash - Is a costumed criminal who carries an energized whip. He became Whiplash later on.
Blood Brothers - Each Blood Brother's tremendous strength and durability is dependent on his proximity to his twin. When standing together, the two have a high degree of superhuman strength, but if separated weaken to below even normal human levels. The Brothers also drain the blood of victims in the manner of a vampire, although it is unclear as to whether they totally rely on blood for sustenance. They have been previously commanded by Thanos and The Controller.
Boomerang - A costumed villain who uses a series of gimmicked boomerangs as his signature weapons.
Detroit Steel - Usually as an adversary or rival to Iron Man. Principal characters in storylines that have worn the armor include Lt. Doug Johnson and Sasha Hammer. Individual soldiers wearing the Detroit Steel armor have been called Steelmechs or Hammermechs.
Doctor Doom - Has a similar relationship with/vendetta against Iron Man/Tony Stark as he does with Reed Richards, who is one of Tony's best friends.
Dreadknight - A disfigured scientist in knight armor with a vendetta against Iron Man and Doctor Doom.
Gargantus - An outer space robot who appeared in the form of a giant Neanderthal Man, as the aliens had last visited Earth 80000 years ago. It hypnotized the people of Granville before being destroyed by Iron Man.
The Ghost - A professional saboteur with equipment that allows him to become intangible who's determined to kill Tony Stark and destroy Stark Enterprises.
Godzilla - Initially, Iron Man, along with the other Avengers, encountered Godzilla when the mutant dinosaur rampaged through New York. Later, while under the control of Doctor Demonicus, a mutated, more amphibious Godzilla attacked Iron Man, only to be later freed of Demonicus' control by him.
Grey Gargoyle - A costumed villain who can turn anything he touches into stone.
Immortus - A master of time itself and future version of Kang the Conqueror, Immortus was responsible for manipulating Iron Man into various acts of villainy (including murder) against the Avengers during the controversial storyline, "The Crossing".
Iron Monger - Obadiah Stane (father of Ezekiel Stane), the business executive who stole Stark Enterprises from Tony Stark. He also found the mask of the first suit that Tony created while being held hostage and perfected it to become the first Iron Monger.
Living Laser - A laser expert who eventually evolved into a being made of pure light energy.
Loki - The brother of Thor who was the supervillain in the movie "The Avengers." He has an army under his control and with the tesseract, can have many superhuman abilities. Iron Man teams up with Hulk, Thor, Captain America, Black Widow, and Hawkeye to form an idea made by S.H.I.E.L.D and defeat Loki and his squadron.
Mad Pharaoh - King Hatap, an Ancient Egyptian Ruler whose knowledge of magic and dreadful acts earned him the nickname 'The Black Pharaoh who fought against Cleopatra, but after failing went into suspended animation by drinking a potion which the Egyptians thought killed him. After being reawakened in modern times he travels to the past with Stark using his Chariot of Time, hoping his scientific technology might help him, planning to defeat Cleopatra, but after his army is defeated by Iron Man he trips onto an upturned sword and is killed. Stark then uses the Chariot of Time to return to the 20th century despite the beauty of Cleopatra.
Madame Masque - The daughter of Count Nefaria, she hides her scarred face behind a golden mask. She often has conflicted loyalties between her father and her lover, Iron Man.
Man-Bull - A villain who was turned into a humanoid bull through experiments.
The Mandarin - Considered by many to be Iron Man's greatest foe, the Mandarin is a Chinese nobleman, scientist and former diplomat turned criminal mastermind. His true power comes from his superhuman mastery of the martial arts and ten rings of power he recovered from an alien spaceship along with highly advanced technology, which he tried to use for World domination.
Mauler - A Scottish mercenary hired by A.I.M. to lead an attack on the S.H.I.E.L.D.helicarrier. He wears an armored suit with deadly weaponry attached, including a rapid fire laser machine gun.
Marauder - A mercenary for hire, he has duel weaponized sabers that come out of his wrists. He also has a built in flame thrower and many other weapons in his arsenal.
Melter - A former business competitor with a beam that can melt iron.
Minotaur - The son of a scientist whose cure for an unspecific disease mutated him into an actual minotaur.
M.O.D.O.K. - A mutagenically altered technician of AIM with superior intelligence (Mental Organism Designed Only for Killing).
Mr. Doll - A hooded man that uses a magical transforming doll (similar to a voodoo doll) which he stole from an African wise-man to attack Iron Man after he causes pain to millionaires to try and make them sign over their fortunes, and Tony Stark becomes his next target. His first appearance was in Tales of Suspense #48. He caused Tony to create a newer, slimmer suit. He is defeated when Iron Man uses a device to remodel the doll to Mr Doll's semblance, meaning when he drops it he is knocked unconscious.
Obadiah Stane a Businessman and a business rival of Tony Stark, at one point he took over Stark Enterprises after Tony Stark succumbed to alcoholism. He was the primary antagonist of the 2008 movie Iron Man.
Sunset Bain - An expert and genius in the field of cybernetics, she is a seller of technological wares for super-villains and the ability to disappear.
The Scarecrow - Ebenezer Laughton, a contortionist performing as The Uncanny Umberto, initially helps Iron Man stop a criminal that had fled into one of his shows. Ebenezer is later approached by operatives of the Mandarin who encourage him to start a new life of crime and industrial espionage using his contortion abilities and a team of trained crows.
The Unicorn - A Soviet supersoldier who was healed and mentored by Titanium Man. His suit is equipped with a cone-shaped blaster on his head.
Ultimo - A Doomsday robot built by an unknown alien race and activated by the Mandarin.
Ultron - An android built by fellow Avenger Hank Pym and responsible for the Sentient Armor going rogue and a recent invasion of Tony Stark's body that transformed him into a robotic duplicate of Janet van Dyne.
Whirlwind - A costumed villain who can create strong whirlwinds by spinning.
Whiplash - A weapons expert who brandishes a specially designed whip as his personal weapon.
Wong-Chu - A Chinese communist leader and expert martial artist who held Tony Stark captive and tried to force him to make weapons for his guerrilla forces. Tony instead created the first Iron Man suit and defeated Wong-Chu.