A gallery containing numerous images of a variety of insect groups is available, as of 2015, at the Penn State entomology website. More photographs of bugs are available at Bug Guide and the National Geographic website.
The Penn State entomology website maintains a large collection of insect images divided into groups based on habitat, relationship to humans and kinship. For example, photographs of insects that live in trees or shrubs get their own pages on the site, as do pantry pests.
Bug Guide's website also contains many bug images. Users can perform an image search to view photographs of bugs from many different taxons. Finally, National Geographic, a website renowned for its nature photography, hosts bug images in online photo galleries.