The Fabulous Furry Freak Brothers is an underground comic about a fictional trio of stoner characters, created by the American artist Gilbert Shelton. The Freak Brothers first appeared in The Rag, an underground newspaper published in Austin, Texas, beginning in May 1968, and were regularly reprinted in underground papers around the United States and in other parts of the world. Later their adventures were published in a series of comic books.

Underground comix are small press or self-published comic books that are often socially relevant or satirical in nature. They differ from mainstream comics in depicting content forbidden to mainstream publications by the Comics Code Authority, including explicit drug use, sexuality, and violence. They were most popular in the United States in the late 1960s and 1970s, and in the United Kingdom in the 1970s.