"The Great Unknown"  
Analog issues April-June, 1991, containing the serialized story
Author Harry Turtledove
First Appearance Analog Magazine
Collected Earthgrip
Illustrator Visco
Genre(s) Science fiction
Publication date April, May and June, 1991
Preceded by "Nothing in the Nighttime"

"The Great Unknown" is a science fiction novella written by Harry Turtledove. It was originally serialized in Analog Magazine in April, May and June, 1991 and later incorporated into Earthgrip as the section entitled "The Foitani".

The story, set about 1000 years into the future, focuses on Jennifer Logan, a former interstellar trader now serving as a professor of literature specializing in science fiction of the Twentieth Century. She encounters the Foitani, an alien species first introduced by Turtledove in "Nasty, Brutish, &. . ." and is kidnapped by one faction.