Octopus vulgaris
- Tom Akkala provides photographs of the common octopus and information on its classification, habitat, adaptation, nutrition, reproduction and interaction with other species.
- http://acadweb.uwlax.edu/07Spring/SAH/BIO203/akkala_thom/

Octopus.com
- Information on the family Octopoda, including locomotion, anatomy, species and cephalopod literature.
- http://www.octopus.com

Colossal Squid (Mesonychoteuthis hamiltoni)
- Information on this species, which is both the largest squid and the largest invertebrate known.
- http://scuba.about.com/od/marinelife/p/colossalsquid.htm

Cephalopoda
- Classification and images of cephalopods from the Tree of Life project.
- http://tolweb.org/tree?group=Cephalopoda&contgroup=Mollusca

CephBase
- Database on cephalopods (octopus, squid, cuttlefish and nautilus), including images, taxonomy, life history, and researchers.
- http://www.cephbase.utmb.edu/

EuroSquid
- Descriptions of current cephalopod research, a directory of researchers, links to publications, and cephalopod news.
- http://www.abdn.ac.uk/~nhi104/

Cephalopod International Advisory Council
- Supports and encourages cephalopod research and communication among cephalopod researchers by means of meetings, workshops, and a newsletter.
- http://www.nbs.ac.uk/public/mlsd/ciac/

Ocean Planet: In Search of Giant Squid
- Myths and facts about the giant squid.
- http://seawifs.gsfc.nasa.gov/squid.html

Cuttlefish: the Sentient Cephalopod
- This page includes a true story of human-cuttlefish interaction, and several photographs.
- http://www.heptune.com/cutfish.html

The Cephalopod Page
- An educational page devoted to cephalopods (nautilus, squid, cuttlefish, and octopus).
- http://is.dal.ca/~ceph/TCP/

Giant Squid (Architeuthis Clarkei)
- Images of Giant Squid from the film Incredible Suckers.
- http://ncca.bournemouth.ac.uk/main/staff/vassili/giant_squid.html

The Octopus News Magazine Online
- An online community and news magazine about octopuses, squids, and other cephalopods.
- http://www.tonmo.com/

National Resource Center for Cephalopods
- Offers resources for cephalopod researchers. Includes photo gallery.
- http://www.nrcc.utmb.edu/