[[quoteright:351:[[TheAndyGriffithShow http://static.tvtropes.org/pmwiki/pub/images/Fife_Security.jpg]]]]
[[TheSheriff Sheriffs]] and [[USMarshal marshals]] often have deputies to assist them. In order to explain how this person isn't the sheriff or marshal, the writers will often make the character clueless.

In its benign form, this just makes the Clueless Deputy TheWatson for their boss, or the protagonist detective. But it can rapidly [[{{Flanderization}} slide downhill]] until the deputy acts like an idiot. Generally, the deputy has some redeeming qualities, such as [[DumbIsGood incorruptibility]], shooting skills or at least the willingness to serve in a dangerous job for low pay, but if the sheriff is a CorruptHick, the clueless deputy may simply be a [[{{Nepotism}} relative who needed a job.]]

The clueless deputy can be counted upon if the writer needs a TheGuardsMustBeCrazy moment to justify the heroes getting out of jail, or to act as an ObstructiveBureaucrat to keep information that could resolve the plot from reaching the sheriff.

On rare occasions, the clueless deputy of a CorruptHick sheriff is unaware of their superior's criminal activities, and when incontrovertible evidence is presented, will arrest the crook to preserve law and order in the county.

See also CluelessDetective, InspectorOblivious and PoliceAreUseless for other clueless law enforcement forces.
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!!Examples:

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[[folder:Anime And Manga]]
* Touta Matsuda in ''Manga/DeathNote'' is consistently the slowest on the uptake in the investigation team. However, this na´ve innocence is why he was chosen as assistant to chief Soichiro Yagami. He is also the best shot on the team, shooting [[spoiler:Light's hands as he is about to kill Near.]]
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[[folder:Film]]
* Junior Justice (son of Buford T. Justice) from the ''SmokeyAndTheBandit'' movies. Seriously, we're talking about a guy who refuses to keep his gun loaded because "it gets too heavy."
* Jake in the western spoof ''SupportYourLocalSheriff'', although he manages his GenreSavvy moments as well.
* Sam Wood, in ''InTheHeatOfTheNight''.
* ''Every'' cop in ''DrowningMona'' is a complete idiot, except (possibly) the Chief of Police.
* Officer Lou, Marge Gunderson's assistant in ''{{Fargo}}''.
* Norman Jonas (Creator/JonathanWinters) in ''Film/TheRussiansAreComingTheRussiansAreComing''.
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[[folder:Literature]]
* Deputy Norris Ridgewick in Creator/StephenKing's Castle Rock stories. Not only does he bear a faint resemblance to Barney Fife (his colleagues mockingly call him "Barney"), but in ''Literature/TheDarkHalf'' his superior actually finds it notable that when Norris discovered a mutilated corpse he had the presence of mind to face ''away'' from the evidence before [[VomitingCop throwing up]]. As we come to find out, "presence of mind" is not one of Norris's strong suits.
** By ''Literature/GeraldsGame'', Norris is now sheriff (apparently one result of some of the events of ''Literature/NeedfulThings''), and has apparently gotten a bit better at presence of mind (see description of handling of Joubert's van). By ''Lisey's Story'', he's even managed to find a wife.
** Nolly Gardener, of ''Literature/SalemsLot'', sort of fits the trope.
* Commander Fuzzel in ''Literature/GalaxyOfFear: The Brain Spiders''. He's struck a deal with Jabba the Hutt, who will turn in dead criminals for the reward money, and is completely oblivious to the fact that [[spoiler: the criminals' brains have been removed and put into other bodies]], despite noticing the strange injuries.
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[[folder:Live Action TV]]
* Barney Fife, of ''TheAndyGriffithShow'', is perhaps the paradigmatic example of this trope.
** After Barney's departure from the show, the character of Warren Ferguson was introduced in an unsuccessful attempt to [[SuspiciouslySimilarSubstitute fill the same role]].
* Enos in ''TheDukesOfHazzard''; his SuspiciouslySimilarSubstitute, Cletus, is a little less so.
** Actually, Enos was a quite competent lawman in his own right. It was more that he was restrained by the incompetence and corruption of Boss Hogg and Roscoe. Boss and Roscoe also deliberately kept him in the dark to what was really going on. When he worked for the LAPD, he built up an impressive record. As well, he was completely honest in all of his activities and the Dukes often said he was the only real law in Hazzard that people could trust and rely on.
* Festus Haggen of ''Series/{{Gunsmoke}}'' was BookDumb, though otherwise pretty sharp. His predecessor, Chester Goode (called Chester Proudfoot in [[Radio/{{Gunsmoke}} the radio version]]), was a little slower-witted.
* Randy Disher from ''{{Monk}}''. A few episodes show that while he's a good cop he simply isn't prepared to deal with the sort of cases that Monk gets.
** Other episodes...[[CloudCuckoolander not so much]].
* Lassie (Det. Lassiter) from ''{{Psych}}'' is a borderline case: not nearly as outrageously stupid as most of the characters listed here, he's still distinctly, and by a fair margin, the dumbest of the major characters, mostly used to provide a very easy mark for Shawn's antics.
** Interestingly he happens to be an extremely competent police officer. It's implied that he has the same problem that Randy, above, has.
* Deputy Perkins, of ''B.J. and the Bear'' and ''The Misadventures of Sheriff Lobo''.
* On ''Series/BabylonFive'', Garibaldi was occasionally assisted by a security guard named Jack, who came off this way, particularly when going through their investigation in the first season finale. [[spoiler: [[ObfuscatingStupidity This was because Jack was The Mole]] and was willfully hindering Garibaldi's investigation.]]
* The ''entire cast'' of ''{{Reno 911}}''. (Except Dangle, who's a lieutenant.)
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[[folder:Video Games]]
* Sgt. Nails of ''EagleEyeMysteries'' falls most unfortunately into this category, although he's actually quite competent as an arresting officer; it's his skills as a detective that are pretty poor, as he tends to overlook certain critical clues when carrying out investigations.
* The more you play ''VideoGame/LegoCityUndercover'', the more you wonder how Frank Honey made it through the academy.
* [[ThoseTwoGuys Eli and Jonah]] from ''VideoGame/RedDeadRedemption''. Jonah is [[SirSwearsALot profane]], [[{{Jerkass}} rude]], and [[MilesGloriosus arrogant]], while Eli is just lazy-eyed and gullible to the charms of the local SnakeOilSalesman. They're [[BunnyEarsLawyer at least competent at their jobs]], however (mostly [[TheBigGuy Eli]]).
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[[folder:Web Comics]]
* Deputy Bart of HarryPotterComics. Because Sheriff Ned is immune to memory charms, Bart's brain has been fried a bit too much from wizards hitting him in their attempts to mind-wipe the Sheriff. Bart remains effective at what he needs to do, though.
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[[folder:Western Animation]]
* Nutsy and Trigger in Disney's version of ''RobinHood''. Not that the sheriff was much better.
* ''{{Fillmore}}'': In the episode where Fillmore visits his old partner in Tennessee, the CorruptHick Safety Patrol sheriff has a CluelessDeputy who's among the few non-corrupt members of the Safety Patrol.
* Inverted in the WesternAnimation/LooneyTunes shorts ''Drip-Along Daffy'' and ''My Little Duckaroo'', in which the sheriff (Daffy Duck) is [[LordErrorProne far more clueless]] than [[TheRadar his deputy]] (Porky Pig).
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