Lord of Light (1967) is a science fantasy novel by American author Roger Zelazny. It was awarded the 1968 Hugo Award for Best Novel, and nominated for a Nebula Award in the same category.Two chapters from the novel were published as novelettes in the Magazine of Fantasy and Science Fiction – "Dawn" in April 1967, and "Death and the Executioner" in June 1967.

Zelazny noted that Lord of Light was written so that it could be taken as a science fiction or a fantasy novel.

On the one hand, I attempted to provide some justifications for what went on in the way of the bizarre; on the other, I employed a style I associate with fantasy in the telling of the story. I wrote it that way on purpose, leaving some intentional ambiguity, because I wanted it to lie somewhat between both camps and not entirely in either. I did this because I did not see much stuff being written at that time which fit that description; because I wanted to see whether I could do it; and because I was curious as to how such a book would be received.

The context of the novel – modern western characters in a Hindu-Buddhist-influenced world – is reflected in the book's opening lines:

His followers called him Mahasamatman and said he was a god. He preferred to drop the Maha- and the -atman, however, and called himself Sam. He never claimed to be a god, but then he never claimed not to be a god.

Published by Granada Publishing Limited 

In Panther Books 1971

Reprinted 1973, 1977