Realization or realisation may be:
- Realization (figured bass), the creating of a musical accompaniment from a figured bass
- Realization (finance), the pricing of a security (or a non-physical asset such as bank deposits, bonds, and participations in companies' share capital), at market value
- Realization (linguistics), the production of an actual form in a human language, from an abstract representation
- Realization (metrology), a physical form of a measurement standard
- Realization (probability), an actually observed value of random variable
- Realization (tax), one of the principles for defining (or making decision about) income for tax purposes in the U.S.
- Realization of an apeirogon, a mapping of an abstract apeirogon
- Realization (systems), a state space model implementing a given input-output behavior
- Realization (climb), a sport climbing route in Ceüse, France
