The Lethal Legion is the name of seven teams of fictional characters appearing in American comic books published by Marvel Comics.

The first version of the Lethal Legion appeared in The Avengers #78 (July 1970).

The second version of the Lethal Legion appeared in The Avengers #164 (October 1977)

The third version in The West Coast Avengers (vol. 2) #1 (October 1985).

The fourth version appeared in Marvel Age Annual #1 (1985).

The fifth version of the Lethal Legion appeared in Avengers West Coast #98 (September 1993)

The sixth version of the Lethal Legion appeared in the limited series Dark Reign: Lethal Legion #1 (August 2009).

The original Lethal Legion is formed by the villain Grim Reaper (the brother of Avenger Wonder Man) and consists of Man-Ape, Power Man, Living Laser, and Swordsman. Man-Ape attacks Captain America, but is beaten back by the Avengers. However, he captures Black Panther's girlfriend Monica, binding her hand and foot with metal clamps. Black Panther is lured into a trap by Man-Ape, and despite getting past him he is knocked out by an exploding dummy of Monica. Black Panther is chained and with Man-Ape, he meets the other members of the Lethal Legion.