Realization or realisation may refer to:

• Realization (album), a 1973 album by Eddie Henderson
• Realization (climb), a sport climbing route in Ceüse, France
• Realization (figured bass), the creating of a musical accompaniment from a figured bass
• Realization (finance), the pricing of security 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 (systems), a state space model implementing a given input-output behavior
• Realization (tax), one of the principles for defining income for tax purposes in the U.S.
• Realization of an apeirogon, a mapping of an abstract apeirogon