Orthoceras was an ancient cephalopod that lived about 370 million years ago. The name means straight horn, referring to the characteristic long, straight, conical shell.

Scientifically Orthoceras is a genus name used only for a particular extinct nautiloid cephalopod from the Baltic states and Sweeden.

Orthoceras fossils are found all over the world. They were plentiful in all of the Palaeozoic oceans. Their hard shell fossilizes easily so that today they are common fossils. Many of the fossils found are from an area near Erfoud, Morocco.

Orthoceras is connected to the Root Chakra to ground us to the earth.