Fact and Fancy is a collection of seventeen scientific essays by American writer and scientist Isaac Asimov. It was the first in a series of books collecting his essays from The Magazine of Fantasy and Science Fiction, and Asimov's second book of science essays altogether (after Only a Trillion). Doubleday & Company first published it in March 1962. It was also published in paperback by Pyramid Books as part of The Worlds of Science series. After he had written 200 essays for Fantasy and Science Fiction (out of 399 in the end), Asimov wrote of them "To this day I get more pleasure out of them than out of any other writing assignment I get." The only essay that did not appear in Fantasy and Science Fiction was "Our Lonely Planet", which first appeared in Astounding Science Fiction.

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