Trust No One: The Official Third Season Guide to The X-Files is a reference book published by HarperPrism that provides an extensive episode guide to Season 3 of The X-Files. First published in 1996, the book was the second volume in a series of reference books; each volume had summaries and production information for the episodes of each season, up to and including Season 7, with the exception of the first volume, The Truth Is Out There: The Official Guide to The X-Files, which pertained to both Seasons 1 and 2.