Validation may refer to:
- Verification and validation, in engineering,` confirming that a product or service meets the needs of its users
- Verification and validation (software), checking that a software system meets specifications and fulfills its intended purpose
- Validation of foreign studies and degrees, processes for transferring educational credentials between countries
- Validation (drug manufacture), documenting that a process or system meets its pre-determined specifications and quality attributes
- Data validation, in computer science, ensuring that data inserted into an application satisfies defined formats and other input criteria
- Regression model validation, in statistics, determining whether a model fits the data well
- XML validation, the process of checking a document written in XML to confirm that it both is "well-formed" and follows a defined structure
- Social validation, compliance in a social activity to fit in and be part of the majority
- the validation of a analytical test method, to show that it is suitable for the purpose it is used