"Pig-Pen" (his real name was never given) is a major character from the newspaper comic strip Peanuts, by Charles M. Schulz. Originally introduced in 1954, he is best known for being constantly dirty and having a cloud of dust around him, to the point that he is even able to become dirty in a rainstorm. With the exception of Peppermint Patty, most of the other kids do not get along well with "Pig-Pen" due to his messiness.
"Pig-Pen" appears in the following specials:
- It's Arbor Day, Charlie Brown (1976)
- Happy New Year, Charlie Brown! (1986) [silent]
- A Charlie Brown Valentine (2002) [silent]