Sturgeon's law is an adage stating "ninety percent of everything is crap". It was coined by Theodore Sturgeon, an American science fiction author and critic, and was inspired by his observation that, while science fiction was often derided for its low quality by critics, most work in other fields was low-quality too, and so science fiction was no different.

Theodore Sturgeon was an American fiction author of primarily fantasy, science fiction, and horror, as well as a critic. He wrote approximately 400 reviews and more than 120 short stories, 11 novels, and several scripts for Star Trek: The Original Series.