Olympians
Aphrodite (Venus*) | goddess of love and beauty
Apollo (Apollo) | god of the arts (esp. poetry and music), archery, and divination
Ares (Mars) | god of war
Artemis (Diana) | goddess of the hunt and protector of children
Athena (Minerva) | goddess of wisdom, war, and crafts; patron of Athens
Demeter (Ceres) | goddess of agriculture and fertility
Dionysos (Bacchus) | god of wine, mysteries, and the theatre
Hephaistos (Vulcan) | god of smiths and metal-workers
Hera (Juno) | goddess of marriage; consort of Zeus
Hermes (Mercury) | god of merchants; messenger of Zeus
Poseidon (Neptune) | god of the sea and earthquakes
Zeus (Jupiter) | god of the sky; ruler of Olympus
Chthonians
The Chthonic deities inhabited the opposite realm from the Olympians - the Earth or the Underworld (chthon means earth in Greek). These immortals therefore acquired a slightly more dark and shadowy aspect than their bright Olympian counterparts. Nevertheless, the following gods had their place in the Greek pantheon, for they fulfilled certain fundamental needs, including providing an explanation for what happens to mortals after death.
Erinyes (Furiae) | also known as Furies, these were female spirits who exacted vengeance against those who committed specific crimes
Keres | Keres were female spirits of death and destruction in ancient Greece
Hades (Pluto) | god of the Underworld and ruler of the dead; husband of Persephone
Hekate (Trivia) | goddess of magic; an alternate spelling of her name is Hecate
Persephone (Proserpina) | goddess of the Underworld and wife of Hades; also known as Kore (the maiden)
Thanatos | god of death
Titans
The Titans were a race of gods who were the parents and precursors of the Olympians. They were defeated by this younger generation of deities, who were led by Zeus. The ancient Greek poet Hesiod, in his Theogony, claims that the goddess Gaia first gave birth to Ouranos, then mated with him to produce these offspring. Later, Ouranos was to name his children Titans, which translates into overreachers.
Atlas | Atlas led the struggle between the Titans and Olympians, and for this he was punished...
Epimetheus | this Titan was the brother of Prometheus; his name means "afterthought"
Gaia (Tellus) | Gaia was an Earth goddess; she is also the mother of the Titans
Hyperion | god who was the father of Helios, Eos, and Selene
Iapetos | god who fathered Atlas, Prometheus, and Epimetheus
Koios | god who mated with Phoebe and together they produced Leto and Asteria
Kreios | god who sired Astraios, Pallas, and Perses
Kronos (Cronus) | it was Kronos, son of Gaia and Ouranos, who castrated his father; in turn, Kronos was the sire of many of the Olympians
Leto (Latona) | the goddess Leto bore the Olympian deities Artemis and Apollo to Zeus
Mnemosyne | the name Mnemosyne means "memory"; she and Zeus together produced the Muses
Okeanos (Oceanus) | god of the Ocean and water; father of the Oceanids ("three thousand slender-ankled daughters")
Ouranos (Uranus) | Ouranos was both the son and the consort of Gaia; he was also the father of the Titans
Phoebe | goddess who conceived Leto and Asteria by the Titan Koios
Prometheus the name of this Titan means "forethought"; in myth, Prometheus was punished for giving fire to humans - he was bound, and daily an eagle would devour his liver
Rheia (Rhea) | Rheia was a mother goddess who bore the deities Hestia, Demeter, Hera, Hades, Poseidon, and Zeus to Kronos
Tethys | the goddess Tethys gave birth to daughters who personified rivers; she was the consort of Okeanos
Theia | Theia was a goddess who mated with Hyperion and consequently bore Helios, Selene, and Eos
Themis | according to Hesiod, the goddess Themis was the second wife of Zeus, and she conceived by him the Seasons (Lawfulness, Justice, and Peace), and the Fates
Free Spirits
Amphitrite | sea goddess; wife of Poseidon
Asklepios (Asclepius) | god of healing
Boreas | god of the north wind
Dike (Iustitia) | goddess of justice
Eileithyia (Lucina) | goddess of childbirth
Eirene (Pax) | goddess who personified peace
Enyo (Bellona) | goddess of war
Eos (Aurora) | goddess of the dawn
Erebus | personification of darkness
Eris (Discordia) | goddess whose name means "discord" or "strife"
Eros (Cupid) | god of love and desire
Eunomia | goddess who personified discipline or good government
Fates (Moirai in Greek, Parcae in Latin) | goddesses who supervised fate; the poet Hesiod names them Clotho, Lachesis, and Atropos
Graces (Charites in Greek, Gratiae in Latin) | a trio of graceful goddesses associated with Aphrodite
Hebe (Juventas) | goddess who was a cup-bearer for the Olympian gods
Helios (Sol) | god of the sun
Hesperus (Vesper) | the evening star
Hestia (Vesta) | goddess of the home and hearth
Himeros | god of sexual desire; companion of Aphrodite
Horae | a trio of goddesses of the Seasons
Hygeia | goddess of health
Hypnos (Somnus) | god of Sleep; brother of Thanatos
Iris | goddess of the rainbow; messenger of Hera
Morpheus | god of dreams
Muses | nine goddesses, each of whom embodied an aspect of the humanities and arts
Nemesis | goddess of retribution
Nereus | sea god who fathered 50 daughters - the Nereids (sea-nymphs)
Nike (Victoria) | goddess of victory
Nymphs | female nature spirits
Nyx | goddess who personifies night
Pan (Faunus) | god of the countryside
Peitho | goddess who personifies persuasion; Peitho often accompanies Aphrodite in myth
Selene (Luna) | goddess of the moon
Triton | water god; son of Amphitrite and Poseidon
Tyche (Fortuna) | goddess of fortune
Zephyrus | god of the west wind