may refer to:
- In international law, the harmonisation of law is the process by which different states adopt the same laws.
- As a result of the operation of international treaties, the regulatory principles of stronger states are often (but not always) transplanted into weaker ones
- The apocryphal act of removing discrepancies between different Gospels. This was done in the past in many ways (see, for example, Diatessaron), although finally Christianity accepted the Gospels with all their discrepancies.
- In music, the implementation of harmony, usually by using chords.