- Butterflies of North America
- Distribution maps, photos, species accounts, and species checklists
- Butterflies of Ecuador
- Systematics, biogeography, and natural history of the butterflies of Ecuador
- Childrens' Butterfly Site
- Pictures, a Monarch coloring page, question and answers, and teacher resources
- Lepidopterists' Society
- International society devoted to the study and appreciation of the insect order Lepidoptera
- LepIndex
- The Global Lepidoptera Names Index (Natural History Museum, London)
- Moths of North America
- Distribution maps, photos, species accounts, and species checklists
- Moths and Butterflies of Europe
- An iconographic sample of European moths and butterflies with information about foodplants, breeding, and life cycle
- Museums
- Museums with significant Lepidoptera holdings
- Noctuid Search
- An interactive key to identify the Noctuidae of North America
- Washington Area Butterfly Club
- Site dedicated to learning more about the butterflies of the Washington DC area
- Web Images of North American Moth Species
- Links to photos and drawings of nearly 2,300 moth species