Strong Bad is a fictional character from the Homestar Runner series of animated Flash web cartoons, inspired by "The Strong Bads" from the video game Tag Team Wrestling. He is portrayed by Matt Chapman, the principal voice actor and co-founder of the series. Strong Bad enjoys pranking the other characters of the series, along with his ever-diligent lackey pet named "The Cheat" and his older brother Strong Mad. The main segment that Strong Bad is a part of is "Strong Bad Email", in which he answers emails sent to him by fans. The Strong Bad Email series grew to be so popular that seven DVDs featuring the emails have been released, as well as a podcast where emails could be downloaded to digital media players, since its first episode in 2001.

The character's face resembles a red lucha libre mask, with 4 laces in the back and a blue diamond centered between his eyes. The diamond has the power to open bottle caps from "Cold Ones" and remove Homestar's hat, though he has only been seen doing this once. His eyes are green and shiny, and apparently turn grey when he is dead.