Of Men and Monsters is a science fiction novel by American writer William Tenn, published in June 1968 as a paperback by Ballantine Books.

People live like vermin in holes in the insulation material of the walls of the homes the monsters have built, sneaking out to steal food and other items from the aliens.

A complex social and religious order has evolved, with women preserving knowledge and working as healers, while men serve as warriors and thieves.

As he is about to embark on his adventure, Eric learns that his uncle has been a secret supporter of a very different philosophy – the idea that "Ancestor-Science" failed to repel the aliens when they first came and therefore to seek the old "science" would be futile.

[5] In Science Fiction Weekly, Adam-Troy Castro called the novel "imaginative and often witty", but faulted the characterization as "both simple and schematic", noting that "(n)obody's interesting, not even the hero.