- American Arachnological Society, The
 - Founded to promote the study of arachnids and to achieve closer cooperation and understanding between amateur and professional arachnologists. - Arachnodata
- Information and coordination agency for arachnid animals in general and scorpions in particular. In German and English.
- Australian Spider and Insect Bites
- Information on the only three Australian spiders, anthropods, and insects capable of causing death - the red back and funnel-web spiders, and the paralysis tick.
 British Arachnological Society
- Promoting the study of Arachnida, especially spiders, pseudoscorpions, and harvestmen. Includes membership and meeting information, checklist of British spiders, and publications.- Class Arachnida
- Large Class of arthropods includes over 60,000 described species. Spiders make up the majority; closely followed by mites and ticks.
- Common Names of Arachnids 2003
(PDF) - Publication from the American Arachnology Society.
- eNature.com: Insects and Spiders
- Nature and wildlife field guide for a variety of insects and arachnids: water bugs, beetles, grasshoppers, ants, dragonflies, bees, ticks, spiders, and more.
- Everything about Arachnids
- Presents pictures, information, and characteristics of scorpions, spiders, mites, and ticks.
- International Society for Arachnology (ISA)
- Focuses on the arachnid orders Amblypygi, Araneae, Opiliones, Palpgradi, Pseudoscorpiones, Ricinulei, Schizomida, Scorpiones, and Uropygi, but not Acari.
- Journal of Arachnology On-Line
- Official journal of the American Arachnological Society.
- Tree of Life: Arachnida
- Guide to the natural history of spiders, mites, scorpions, whipscorpions, and pseudoscorpions.
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