Happy Tree Friends is an American adult animated web series created by Aubrey Ankrum, Rhode Montijo, and Kenn Navarro, and developed by Montijo, Navarro, and Jeremy Viet Duong for Mondo Media. The show has achieved a cult following on Mondo Media, G4 and YouTube. Montijo, Navarro, Graff, Ankrum serving as showrunners.

Being an adult show disguised as a children's show, the series features cartoon anthropomorphic forest animals. The show is best known for its episodes starting out peacefully with the animals living life as normal, but a sudden event unintentionally (sometimes intentionally) caused by another animal leads to many of the characters being subjected to very extreme and cruel graphic violence and suffering brutal deaths. Each episode revolves around the characters enduring accidental or deliberately inflicted pain, murder or mutilation.