| ARSO | African Organization for Standardization |
| APAC | Asia Pacific Accreditation Cooperation |
| APMP | Asia Pacific Metrology Programme |
| APLMF | Asia-Pacific Legal Metrology Forum |
| CITAC | Cooperation on International Traceability in Anaytical Chemistry |
| CMS | Coordinate Metrology Society |
| EURAMET | EURAMET Regional Metrology Organisation (RMO) of Europe |
| COOMET | Euro-Asian Cooperation of National Metrological Institutions |
| EURAMET | European Association of National Metrology Institutes |
| WELMEC | European Cooperation in Legal Metrology |
| EMATEM | European Metrology Association for Thermal Energy Measurement |
| SIM | Inter-American Metrology System
Sistema Interamericano de Metrologia |
| BIPM | International Bureau of Weights and Measures |
| ILAC | International Laboratory Accreditation Cooperation |
| IMEKO | International Measurement Confederation |
| OIML | International Organization of Legal Metrology |
| NCSLI | NCSL International |
