Or All the Seas with Oysters is a collection of fantasy and science fiction short stories, written by Avram Davidson.

It was first published in paperback by Berkley Medallion in 1962.

The first hardcover edition was issued by White Lion in January 1976, and a second paperback edition by Pocket Books in December of the same year.

[1] The book collects eighteen novelettes and short stories by the author.

The collection was reviewed by P. Schuyler Miller in Analog Science Fact -> Science Fiction, February 1963, Michael Bishop in Delap's F & SF Review, March-April 1978, and Everett F. Bleiler in The Guide to Supernatural Fiction, 1983.