| World Organisation of Gastroenterology | 03/2000 - | Council Member | | Professor Lam Lam Shiu Kum |
|
| World Organization for Early Childhood Education (OMEP)-Hong Kong | 09/2005 - 08/2007 | Member | | | 2011-2013 | Board Member | | |
|
| World Organization of Building Officials | 01/2008 - 8/2009 | Corporate Member | | |
|
| World Organization of Family Doctors | 2004-2021 | Member, Working Party on Research | | | 2016-2010 | Asia Pacific Chair, Working Party for Mental Health | | |
|
| World Police Medical Officers | |
| World Policy Journal | 2009 - current | Editorial Board member | | |
|
| World Professional Association for Transgender Health | 06/09- | Director | | | 05/09- | Member | | |
|
| World Psychiatric Association Epidemiology and Public Health Section | 07/2017 - 07/2027 | Full Member | | |
|
| World Psychiatric Association-Young Psychiatrist Council | 2008-present | Young Psychiatrist Representative | | |
|
| World Register of Marine Species (WoRMS) | 2013-2017 | Podocopida (Ostracoda) editor | | |
|
| World Sleep Society (WSS) | |
| World Stroke Organization | |
| World Stroke organization | 2021-now | Early career stroke professionals committee | | |
|
| World Sustainable Built Environment Conference 2017 Hong Kong (WSBE17), Hong Kong, 5-7 June 2017 | 06/2017 | International Scientific Review Panel | | |
|
| World Trade Organization: Regional Trade Policy Course for Officials of Asia-Pacific Countries | 2003-present | Trainer/lecturer | | |
|
| World Transport Convention (WTC) | 01/2019-12/2019 | Chair of Transportation Planning Track | | |
|
| World Transport Convention TOD Integration Committee | |
| World wide fund for nature | 7/2017 - present | Member of Education Committee | | |
|
| Worldwide Teachers' Network | 03/2012-Present | Co-founder | | Mr Hashimoto Hashimoto Takuro |
|
| Worman in Transplantation of TTS | Since 2010 | Founder member and international turor | | |
|
