| OAA | since 09/1985 | Member | | Professor Hui Hui Cheuk Kuen Desmond | 1988-present | Full Member | | |
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| OAIDF | since 1990 | Registered architect in France, Member, Ordres des Architectes Francais | | |
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| OARSI | 02/2019-01/2020 | Member | | Dr Sun Sun Yi |
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| Observational Health Data Sciences and Informatics (OHDSI) | 01/2021-present | Asia-Pacific Steering Committee | | |
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| Occupational Safety and Health Consultants Register | 08/2016-12/9999 | Registered Consultant | | |
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| Occupational Safety and Health Council | 08/2023 - | Vice-chairman | | | 08/2018-08/2023 | Member | | |
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| Ocean Park | |
| Ocean Park - Education Advisory Committee | |
| Office of the Ombudsman for UN Funds and Programs | 2022 | Global Arbitrators List | | |
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| Official College of Doctors of Barcelona | 05/2016-08/2021 | Affiliated doctor | | Dr Martin Sanchez Martin Sanchez Mario |
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| OIE | |
| OIE/FAO OFFLU Technical Committee on Avian Influenza Diagnostics | |
| OMED (World Organisation of Digestive Endoscopy) Colon Cancer Screening Committee | 01/2003-present | committee member | | |
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| OMEP | 9/2016 - up to now | member | | Ms Kwan Kwan Lai Ching |
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| OMEP (World Organisation of Early Childhood Education) | | Executive Committee Member | | | | Member | | |
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| OMEP-Hong Kong | 01/2013-12/2013 | Executive Secretary | | Dr Lee Lee Pui Ling Diana |
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| OMGE (World Gastroenterology Organisation) subcommittee on development of digestive cancers | 01/2001-12/2001 | committee member | | |
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| OMGE (World Gastroenterology Organisation) working group on role of gastroenterologist in management of GI cancer patients | 01/1999 - 12/1999 | committee member | | |
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| OMICS group, Journal of Bioanalysis & Biomedicine | 07/2009-present | Editorial board member | | |
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| OMICS group, Journal of Bioequivalence & Bioavailability | 07/2009-present | Editorial board member | | |
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