Mr. B's Lost Shorts is a compilation of shorts from Mystery Science Theater 3000. Originally released exclusively through the MST3K Info Club, it was later re-packaged with Rhino Entertainment's boxed set Volume 6 in October of 2004. There were six shorts included.

The "Mr. B" of the title is, of course, the titular Mr. B Natural. It is probably for this reason that this is the only shorts collection where the shorts are not organized in their original chronological order of release.

• "Mr. B Natural"
• "X Marks the Spot"
• "Hired, Part 1"
• "Design For Dreaming"
• "Johnny at the Fair"
• "Are You Ready For Marriage?"

"Design For Dreaming" was also included with the limited edition Shorts, Volume 3. "Are You Ready For Marriage?" label-jumped onto Shout Factory by being also included with its original episode Racket Girls on Volume 15.