Novels:
* The Border Country (1960) - considered his most famous work, a powerful novel set in a mining community in Wales.
* The Song of the City (1962) - a story about a man who moves from Wales to London and tries to find his place in the city.
* The Chair (1966) - a novel about a Welsh family and their secrets.
* The Instrument (1969) - a novel about a man who is haunted by his past.
* The Clowns (1974) - a novel about a group of clowns and their lives.
* A Game for the Gods (1977) - a novel about a group of people who are forced to play a game for their lives.
* The Sea is My Brother (1981) - a novel about a young man who is shipwrecked on a desert island.
* The Third Angel (1987) - a novel about a man who is trying to find his identity.
Plays:
* The Song of the City (1962) - a stage adaptation of his novel.
* The Chair (1966) - a stage adaptation of his novel.
* The Instrument (1969) - a stage adaptation of his novel.
* The Clowns (1974) - a stage adaptation of his novel.
* A Game for the Gods (1977) - a stage adaptation of his novel.
Other Works:
* He also wrote several short stories and essays.
Williams' work is characterized by its exploration of themes of identity, belonging, and the search for meaning. He is considered to be one of the most important Welsh writers of the 20th century. He was a prominent figure in the Welsh literary scene and won numerous awards for his work.