In Deep is a collection of eight science fiction short stories by American writer Damon Knight. The stories were originally published between 1951 and 1960 in The Magazine of Fantasy and Science Fiction, Rogue and other magazines.

In Deep

Cover art for In Deep
Author	Damon Knight
Country	United States
Language	English
Genre	Science fiction
Publisher	Berkeley Medallion Books
Publication date	1963
Media type	Print (Paperback)
Pages	158 pp

The book contains the short story "The Country of the Kind", considered by many to be Knight's finest.

The story "The Handler" was omitted from British editions of the book.