"The Isolinguals" is a science fiction story, addressing the concept of ancestral memory, by American writer L. Sprague de Camp. It was his first published story. It was first published in the magazine Astounding Stories for September, 1937, and first appeared in book form in the anthology First Flight: Maiden Voyages in Space and Time (Lancer Books, Aug. 1963; reprinted Nov. 1966 and Nov. 1969 (as Now Begins Tomorrow). It later appeared in the anthologies First Voyages (Avon Books, May 1981), Tales in Time (White Wolf Publishing, Apr. 1997), and Wondrous Beginnings (DAW Books, Jan. 2003), as well as the de Camp collection Years in the Making: the Time-Travel Stories of L. Sprague de Camp (NESFA Press, 2005).