The largest octopus is the Pacific Giant Octopus, Enteroctopus dofleini. According to data from a 1987 Masters Thesis from J.A. Cosgrove, the Pacific Giant Ocotopus can reach a weight of over 150 pounds (>70kg). Our friend Jason Bradley, underwater photographer extraordinaire and honorary DSN photographer (post, post, post, post) captured this amazing shot at God’s Pocket in British Columbia. He estimates is only to be just over 30 pounds.