Peeping Tom laws—also known as voyeurism laws or invasion of privacy laws—generally make it illegal and a criminal offense to peek into windows or doors on private property to view a person who is fully or partially naked for the purpose of sexual desire or gratification.

Peeping Tom laws vary from state to state and some states require that the victim not realize he or she was being viewed and that the victim had a reasonable expectation of privacy (was in a place where it was reasonable to expect privacy). And some states specifically address the use of unmanned aircraft (drones), cameras, video cameras, and binoculars in connection with such peeping. Some state statutes specifically prohibit peeking into bathrooms, dressing rooms, showers, and baths. And some states characterize this criminal offense as trespassing with the intent to peer or peep.

Peeping Tom laws are located in a state’s statutes—often in the penal or criminal code.

In Washington State, Peeping Tom laws are addressed under the state's voyeurism statutes. According to RCW 9A.44.115, voyeurism is considered a Class C felony. The law makes it illegal for an individual to view, photograph, or film another person without their consent in a place where they have a reasonable expectation of privacy, such as bedrooms, bathrooms, dressing rooms, or any place where a person may be undressing or engaging in sexual activity. This expectation of privacy extends to situations where the person being viewed, photographed, or filmed is in a state of undress or is engaged in an intimate act, and the viewing is done for the purpose of sexual gratification. The use of devices like cameras, drones, or any other means to enhance the ability to view or record the victim is also covered under this statute. Washington law does not require the victim to be unaware of the observation for the act to be considered voyeurism. Additionally, the state's trespassing laws may also apply in cases where an individual enters another's property with the intent to commit voyeurism.