Arranged Alphabetically by Greek Name

Greek Name     Roman Name     Role
Aphrodite      Venus          Goddess of beauty
Apollo         Apollo         God of prophecy, medicine and archery (also god of sun)
Ares           Mars           God of war
Artemis        Diana          Goddess of the hunt (also goddess of the moon)
Asclepius      Aesculapius    God of medicine
Athena         Minerva        Goddess of arts and crafts and at one time, the goddess of war; helper of heroes (also the goddess of wisdom)
Cronus         Saturn         God of the sky before Zeus; ruler of the Titans (in Roman mythology, god of agriculture)
Demeter        Ceres          Goddess of the harvest
Dionysus       Bacchus        God of wine and vegetation
Eros           Cupid          God of love
Gaea           Terra          Mother Earth
Hades          Pluto          God of the underworld
Hephaestus     Vulcan         God of fire and god of metalworking
Hera           Juno           Goddess of marriage and childbirth; queen of the gods
Hermes         Mercury        Messenger of the gods
Hestia         Vesta          God of the hearth
Hypnos         Somnus         God of sleep
Poseidon       Neptune        God of the sea
Rhea           Ops            Wife of Cronus/Saturn; Mother Goddess
Uranus         Uranus         God of the sky; Father of the Titans
Zeus           Jupiter        God of the sky; ruler of the gods

Arranged Alphabetically by Roman Name

Greek Name     Roman Name     Role
Asclepius      Aesculapius    God of medicine
Apollo         Apollo         God of prophecy, medicine and archery (also god of sun)
Dionysus       Bacchus        God of wine and vegetation
Demeter        Ceres          Goddess of the harvest
Eros           Cupid          God of love
Artemis        Diana          Goddess of the hunt (also goddess of the moon)
Hera           Juno           Goddess of marriage and childbirth; queen of the gods
Zeus           Jupiter        God of the sky; ruler of the gods
Ares           Mars           God of war
Hermes         Mercury        Messenger of the gods
Athena         Minerva        Goddess of arts and crafts and at one time, the goddess of war; helper of heroes (also the goddess of wisdom)
Poseidon       Neptune        God of the sea
Rhea           Ops            Wife of Cronus/Saturn; Mother Goddess
Hades          Pluto          God of the underworld
Cronus         Saturn         God of the sky before Zeus; ruler of the Titans (in Roman mythology, god of agriculture)
Hypnos         Somnus         God of sleep
Gaea           Terra          Mother Earth
Uranus         Uranus         God of the sky; Father of the Titans
Aphrodite      Venus          Goddess of beauty
Hestia         Vesta          God of the hearth
Hephaestus     Vulcan         God of fire and god of metalworking

from http://mythopedia.hypermart.net/textonly/mythologies/greek/deities/listgods.htm