Product certification or product qualification is the process of certifying that a certain product has passed performance tests and quality assurance tests, and meets qualification criteria stipulated in contracts, regulations, or specifications.

A certification mark on a commercial product or service is a registered mark that enables its owner to certify that the goods or services of a particular provider have particular properties, e.g., regional or other origin, material, quality, accuracy, mode of manufacture, being produced by union labor, etc. The standards to which the product is held are stipulated by the owner of the certification mark.