Validation may refer to:

• Data validation, in computer science, ensuring that data inserted into an application satisfies defined formats and other input criteria
• Forecast verification, validating and verifying prognostic output from a numerical model
• Regression validation, in statistics, determining whether the outputs of a regression model are adequate
• Social validation, compliance in a social activity to fit in and be part of the majority
• Statistical model validation, determining whether the outputs of a statistical model are acceptable
• Validation (drug manufacture), documenting that a process or system meets its predetermined specifications and quality attributes
• Validation (gang membership), a formal process for designating a criminal as a member of a gang
• Validation of foreign studies and degrees, processes for transferring educational credentials between countries
• Validation therapy, a therapy developed by Naomi Feil for older people with cognitive impairments and dementia
• Verification and validation (software), checking that software meets specifications and fulfills its intended purpose
• Verification and validation, in engineering, confirming that a product or service meets the needs of its users
• XML validation, the process of checking a document written in XML to confirm that it both is "well-formed" and follows a defined structure