Alpha Quality Certification Ltd. (AQ Cert) is an international certification body headquartered in Sofia, Bulgaria, providing accredited management system certification since 1990. The organization operates in accordance with ISO/IEC 17021-1, International Accreditation Forum (IAF) requirements, European co-operation for Accreditation (EA) guidance and the accreditation procedures of the Executive Agency "Bulgarian Accreditation Service" (EA-BAS). In 2021, the company changed its legal name from AQ Cert Ltd. to Alpha Quality Certification Ltd., while maintaining continuity of its operations and accreditations.

AQ Cert provides accredited certification for ISO 9001, ISO 14001, ISO 22000, ISO/IEC 27001, ISO 45001, ISO 37001, ISO 39001 and ISO 50001 management systems. Through partnerships with DAkkS, SNAS and UAF accredited organizations, it also offers certification for standards including ISO/IEC 20000-1, FSSC 22000 and ISO 13485. The certification body states that it applies the same certification principles to organizations regardless of their size, location or industry and currently delivers certification services in Bulgaria, Romania, North Macedonia and Italy.