Mystery Diners is an American reality television series that aired on the Food Network from December 14, 2011, to April 27, 2016. Charles Stiles, the owner of California-based Business Evaluation Services and Mystery Shopper Services, hosts the series.

The show focuses on the Mystery Diners, an organization led by Charles Stiles that goes undercover at restaurants at their owners' request, and sets up stings and hidden surveillance cameras to catch misbehaving employees in the act.

Season 9 saw Charles Stiles begin to use private investigators.

A disclaimer at the end of the credits reads- "The people and events depicted in this program are real. Certain events may have been re-enacted for dramatic purposes."

Television reviewer Ben Pobjie wrote "Mystery Diners has achieved enormous success on SBS Food Network despite not attempting whatsoever to appear convincing. This show, which purports to 'expose' employees of restaurants ripping off their employers, contains so many implausible scenarios, inept actors and transparently fake denouements that it's really quite refreshing." But this is only an opinion which is not substantiated by any facts.

Green text means the target/s was/were not guilty of the/all crime/s.

Blue text means the target/s was/were guilty of the/a different crimes or was/were tricked into being part of the main crime/s, where they were occasionally spared.

Red text means the target/s was/were guilty of the main crime/s and was/were fired or quit.