Parasite Pig is a young adult science fiction novel written by William Sleator.

Parasite Pig follows the character of Barney, who has been working part-time at an after-school job in order to pay for the repairs for his house.

The aliens still have plans for Barney and he must deal with talking parasites, giant crustaceans, and a wasp woman.

Critical reception for Parasite Pig has been mostly positive.

[4] The Washington Post reviewed the book, stating that "The dialogue is deficient, the characterization right out of "Scooby Doo," the budding romance inane.