The Left Hand of Darkness 1969: The story of a man named Genly Ai who attempts to bring the world Gethen into his planet Ekumen's scoiety. A Nebula and Hugo winner.
The Lathe of Heaven 1971: George Orr's dreams become reality and his power gets abused by his psychologist. A Nebula and Hugo winner.
The Dispossessed 1974: Set in the same universe as The Left Hand of Darkness, this is a utopian story about an anarchist society. Another Nebula and Hugo winner.
The Word For World is Forest 1976: A story about the problems of human colonization on other planets. Once again, a Nebula and Hugo winner.
Always Coming Home 1985: A post-apocalyptic novel about the "Kesh" people, a fictional culture living in Northern California.
Fantasy:
Most Le Guin fantasy stories come from her popular Earthsea series. The series was started by her book A Wizard of Earthsea, published in 1964. The theme of these stories is coming-of-age and they are set on an archipelago where wizards, people, and dragons live. Eathsea is a land where magic exists. The other books from this series are: The Tombs of Atuan (1971), The Farthest Shore (1972), Tehanu (1990), Tales From Earthsea (2001), and The Other Wind (2001).