Vermin are pests or nuisance animals that spread diseases or destroy crops, livestock, and property. The term "vermin" is used to refer to a wide scope of organisms, including rodents (such as rats), cockroaches, termites, bed bugs, ferrets, stoats, sables, and any species that can develop into vermin if introduced into a region where there are favorable living conditions and few natural predators. Vermin can be found in both urban and rural areas, and they vary by region and enterprise. The term derives from the Latin vermis (worm), and was originally used for the worm-like larvae of certain insects, many of which infest foodstuffs.

Examples of vermin include goats on the Galápagos Islands, rabbits in Australia, or cats on Prince Edward Islands. Rats, mice, and cockroaches are common urban and suburban vermin. Vermin can be harmful and difficult to control when they appear in large numbers. They are often seen as an invasive species, and humans often choose to fill the role of the predator to limit the danger to the environment.