The 12 chief Greek gods are:

1. Zeus: King of the gods, god of the sky and thunder.
2. Hera: Goddess of marriage, family, and childbirth.
3. Poseidon: God of the sea, earthquakes, and storms.
4. Demeter: Goddess of the harvest and fertility.
5. Ares: God of war and bloodshed.
6. Aphrodite: Goddess of love, beauty, and fertility.
7. Apollo: God of music, poetry, healing, and prophecy.
8. Artemis: Goddess of hunting, wilderness, childbirth, virginity, and young girls.
9. Hephaestus: God of fire, metalworking, and sculpture.
10. Hermes: Messenger of the gods, god of trade, travel, and thieves.
11. Athena: Goddess of war, wisdom, crafts, and strategy.
12. Dionysus: God of wine, revelry, fertility, and theater.