Cosmic Engineers is a science fiction novel by American author Clifford D. Simak.

The novel concerns a group of earthmen and a girl, who is awakened from suspended animation, being contacted by aliens with whom they join to prevent the collision of one universe with another.

Groff Conklin found the 1950 text "has an old-fashioned and somewhat frenetic ring to it which, nevertheless, is rather pleasant.

"[1] Damon Knight, however, panned the same edition as "a pot-boiler [which] should have been left interred" and noted that the 70th-century's inhabitants "talk, think, and act exactly like middle-class, middle-intellect 1930s Americans.

"[3] Stephen King mentions Cosmic Engineers in Hearts in Atlantis,[4] and also in his memoir On Writing, describing Simak's novel as "a terrific read".