Dual-purpose is a noun and adjective referring to things serving two purposes. It can specifically refer to:
- Dual-use technology
- Dual-purpose gun, a naval artillery mounting designed to engage both surface and air targets
- Dual-Purpose Improved Conventional Munition
- Dual-purpose motorcycle, designed for both on- and off-road use
- Dual Purpose Ladder (London Fire Brigade), a standard type of firefighting vehicle used by the London Fire Brigade
- Fighting knife
- Viaduct, a road bridge-aqueduct
- Dual-purpose breed, an animal or plant breed that provide at least two types of resources, for example, dual-purpose chicken breeds, bred for meat and egg production