The following is a list of Greek, Roman, and Egyptian deity equivalents that is based on usage among the ancient people themselves. Although these gods are equated with one another, they should not be interpreted as the same god. For example, when the myths or worship of a Roman deity were influenced by the Greek and Etruscan practices, the deity may have had an independent origin and a tradition that is culturally distinctive.
Some pairs of Greek and Roman gods are believed to have been derived from a common Indo-European archetype and exhibit similar functions due to this. For example, although Ares and Mars are the war gods of Greek and Roman mythology respectively, Ares was a relatively minor figure in Greek mythology while Mars as the father of the Romans and a central figure in archaic Roman religion.