Let'em Breathe Space is a science fiction novella by American author Lester del Ray, first published in 1953.

Eighteen men and two women in the closed world of a space ship for five months can only spell tension and trouble—but in this case, the atmosphere was literally poisoned.

The old space freighter Wahoo is all Dr. Pietro can afford for his expedition to the rings of Saturn. Although built for a crew of 6 the good doctor crams 19 people into the Wahoo, and after 5 months they are really getting on each other’s nerves.

Then someone starts killing people and poisoning the air giving plants in the hydroponics bay. Can our hero Paul Tremaine find the killer before he suffocates? Perhaps you should hold your breath.

Let’em Breathe Space was first published in the July 1953 edition of Space Science Fiction magazine. 

Lester del Rey (1915 - 1993) was an American science fiction author and editor. He was the author of many books in the juvenile Winston Science Fiction series, and the editor at Del Rey Books, the fantasy and science fiction imprint of Ballantine Books. 

Del Rey was awarded the 1972 E. E. Smith Memorial Award for Imaginative Fiction (for the Skylark) by the New England Science Fiction Association and a special 1985 Balrog Award for his contributions to fantasy, voted by fans and organized by Locus Magazine. The Science Fiction Writers of America named him its 11th SFWA Grand Master in 1990.