Tricephalous is a fictional three-headed monster appearing in American comic books published by Marvel Comics.

Tricephalous first appeared in Fantastic Four #1 and was created by Stan Lee and Jack Kirby.

Tricephalous is a three-headed creature (similar to Godzilla's King Ghidorah) that was created on Monster Island by the Deviants under the command of Kro. When Monster Island was attacked by Monster Hunters, Warlord Kro had Tricephalous attack while Kro escaped. Though much of Monster Island was destroyed, Tricephalous became a servant of the Mole Man.

When the Fantastic Four arrived on Monster Island, Tricephalous tried to stop them. However, it was caught off guard and was defeated.

A Skrull named De'Lila arrived looking for the Inorganic Technodrome and took over Tricephalous and the other monsters causing them to go on a rampage. When De'Lila is defeated, Tricephalous and the other monsters return to Monster Island with the Punisher on their trail. However, he abandons the chase after seeing the Fantastic Four.

While Mole Man was in his castle at the time he was discussing letting Adam Warlock live on Monster Island, Tricephalous was shown circling Mole Man's castle.

While Pip the Troll was having a picnic on Monster Island, Tricephalous was seen scouring for food.

When Silver Surfer was visiting Adam Warlock, Tricephalous was shown with two unnamed monsters.