- (AU) Weed Science Society of Victoria
 - Promotes the practice of weed science and management; publishes material on weed control, biology, environmental weeds and plant protection. - Aquatic Ecosystem Restoration Foundation (AERF)
- Aquatic herbicide manufacturers, formulators, and distributors conducting and supporting applied research on the management of aquatic pest species, with a focus on nuisance vegetation.
- Canadian Weed Science Society
- A Canadian national society dedicated to the study and understanding of weeds and their impact on the agricultural landscape. Site includes photos and information on common weeds, poisonous weeds, and weeds that cause dermatitis and hay fever in humans.
- Weed Science Society of America (WSSA)
- With society publications, plant photos, and weed information.
- Western Society of Weed Science
- Fosters weed research, education, and control programmes and cooperation among local, state, federal, and private organisations.
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