A pack rat is a small rodent in the genus Neotoma.
Pack rat can also refer to:
A person who engages in compulsive hoarding
Computing Packrat parser, a parser that uses a parsing expression grammar
Entertainment Peter Pack Rat, a 1985 arcade game Packrat (Transformers), a fictional character in the Transformers universe Pack Rat, a minor villain from Batman: The Animated Series. Packrat, a villain from Ryan's World See also Rat Pack (disambiguation)