Agumon is a Rookie Digimon creature from the Japanese Digimon media franchise that comprises anime, manga, toys, video games, trading card games and other media. He is the unofficial mascot for the Digimon franchise as he and his alternate forms (called Digivolutions) are featured in almost all Digimon media/merchandise. The name "Agumon" is partly derived from the Japanese onomatopoeia "aguagu", the sound of biting, and from the suffix -mon (short for "monster") which all Digimon carry at the end of their names. Thus, Agumon is literally a "biting monster". Coincidently, the world "Agu" also means Fire in Nepalese as Agumon often is seen using fire attacks.

"Agumon" is the name that all members of this particular Digimon species share. There are several different Agumon that appear in various Digimon anime and manga series who are almost always main Digimon characters. Each lead Agumon is partnered (bonded) with a child called a DigiDestined. DigiDestined are children chosen by benevolent beings (usually a group of ancient, powerful Digimon) to defeat evil forces in the Digital World, the plane on which all Digimon live. The DigiDestined use their psychological states to trigger their Digimon to transform into a Digivolved form. Digivolution changes a Digimon's species and increases its power dramatically.

The most well-known appearance of Agumon is in the Digimon Adventure anime as the partner of Taichi Kamiya (called "Tai" for short). An Agumon also appears as a main character in Digimon Savers, partnered to Masaru Daimon. In the Digimon Next manga one is partnered to Tsurugi Tatsuno, and another with Teru Raku in the D-Cyber Chinese manhua.

The Agumon of Digimon Adventure also appears in the sequel series Digimon Adventure 02 and all the Digimon Adventure/02 related movies.

He is a cross between a fire breathing dragon and a Tyrannosaurus Rex.