- Alaska Committee for Noxious and Invasive Plants Management- Web page
- Aquatic Plant Management Society – Web page
- Asian Pacific Weed Science Society – Web page
- Asociación Latinoamericana de Malezas (ALAM) (Latin American Weed Association) – Web page
- Association Française de Protection des Plantes (The French Association for Plant Protection) – Web page
- Atlantic Vegetation Management Association – Web page
- Bosnia and Herzegovina Weed Science Society
- Brazilian Society of Weed Science – sbcpd@sbcpd.org
- California Invavasive Plant Council (Cal-IPC)- Web page
- Canadian Weed Science Society (formerly Expert Committee on Weeds) – Web page
- Center for Invasive Plant Management – Web page
- Colorado Weed Management Association – Web page
- Council of Australasian Weed Societies (CAWS) – Web page
- The Crop and Weed Science Society of West Bengal – Web page
- European Weed Research Society – Web page
- EWRS Biological Weed Control Working Group – Web page
- EWRS Crop-Weed Interactions – Web page
- EWRS Education and Training Working Group – Web page
- EWRS Germination and Early Growth Working Group- Web page
- EWRS Herbicide Resistance Working Group – Web page
- EWRS Invasive Plants Working Group – Web page
- EWRS Optimisation of Herbicide Dose- Web page
- EWRS Parasitic Weeds Working Group- Web page
- EWRS Physical and Cultural Weed Control Working Group – Web page
- EWRS Site Specific Weed Management Working Group – Web page
- EWRS Weed Management in Arid and Semi-Arid Climate Working Group – Web page
- EWRS Weed Management Systems in Vegetables Working Group – Web page
- EWRS Weeds and Biodiversity Working Group – Web page
- EWRS Weed Mapping Working Group – Web page
- Florida Weed Science Society – Web page
- Herbicide Resistance Action Committee- Web page
- Herbolosko drustvo BiH (tsaric@bih.net.ba)
- Hungarian Weed Research Society (HWRS) (lradics@omega.kee.hu)
- Indian Society of Weed Science – Web page
- Industrial Vegetation Management Association of Alberta (IVMAA) – Web page
- Integrated Vegetation Management Association of Manitoba/Saskatchewan (IVMA Man/Sask) – Web page
- Integrated Vegetation Management Association of British Columbia (IVMA of BC) – Web page
- International Allelopathy Society – Web page
- International Association for the Plant Protection Sciences (IAPPS) – Web page
- International Parasitic Plant Society – Web page
- International Weed Science Society – Web page
- Invasive Species Specialist Group – Web page
- Iranian Weed Science Society (mhrashed@yahoo.com)
- Korean Society of Weed Science (chungbj@dongbu.com)
- Lietuvos herbologu draugija (Lithuanian Weed Science Society) (raustep@nora.lzuu.lt)
- Montana Weed Control Association – Web page
- National Railroad Contractors Association – Web page
- Near East Weed Science Society (barakat@agr.ju.edu.jo)
- New Zealand Plant Protection Society (Inc.) – Web page
- The Nicaraguan Weed Science Society (freddy@una.edu.ni / freddy@ibw.com.ni)
- North American Invasive Species Management Association – Web page
- North Central Weed Science Society – Web page
- Northeastern Weed Science Society – Web page
- Northern Interior Vegetation Management Association (manager@nivma.bc.ca)
- Ontario Vegetation Management Association (OVMA) – Web page
- Sociedade Brasileira da Ciêcia das Plantas Daninhas (sbcpd@cnpso.embrapa.br)
- Sociedad Cubana de Malezologia (Cuban Weed Science Society) (jcdiaz@inica.edu.cu)
- Sociedad Española de Malherbología (SEMh) (Spanish Weed Science Society) – Web page
- Sociedad Venezolana Para el Combate de Malezas (SOVECOM) (Venezuelan Society for Weed Control) – Web page
- Società Italiana per la Ricerca sulla Flora Infestante (S.I.R.F.I.) formerly “Società Italiana per lo studio della Lotta alle Malerbe” (S.I.L.M.) (Italian Weed Research Society) (agronomy@unipg.it)
- The South African Weed Science Society – Web page
- Southern Weed Science Society – Web page
- Southwest Vegetation Management Association – Web page
- Tasmanian Weed Society (Inc) – Web page
- Texas Vegetation Management Association – Web page
- Turkish Weed Science Society (nuygur@cu.edu.tr)
- Weed Management Society of South Australia – Web page
- Weed Science Society of America – Web page
- Weed Science Society of China – Web page
- Weed Science Society of Israel – Web page
- Weed Science Society of Japan – Web page
- Weed Science Society of New South Wales Inc. – Web Page
- Weed Science Society of Pakistan (WSSP) – Web page
- Weed Science Society of the Philippines (lualhatinoriel@philwebinc.com)
- Weed Science Society of the Republic of China (WSSROC TAIWAN) – Web page
- Weed Science Society of Serbia –Web page
- Weed Science Society of Thailand (agrsbc@nontri.ku.ac.th)
- The Weed Society of Victoria – Web page
- The Weed Society of Queensland – Web page
- The Weeds Society of Western Australia (Inc.) – Web page
- Western Aquatic Plant Management Society – Web page
- Western Society of Weed Science – Web page
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