Linkage generally means "the manner or style of being united", and can refer to:
- Genetic linkage, the tendency of certain genes to be inherited together
- Flux linkage, the total flux passing through a surface formed by a closed conducting loop
- Linkage (mechanical), assemblies of links designed to manage forces and movement
- Linkage (policy), a Cold War policy of the United States of America towards the Soviet Union and Communist China
- Linkage (linguistics), a group of undoubtedly related languages
- Linkage (software), a concept in computer programming describing how names can or can not refer to the same entity throughout a program
- Linkage (album), the third album by J-pop singer Mami Kawada, released in 2010