->''When they are alone they want to be with others, and when they are with others they want to be alone. After all, human beings are like that.''
-->--'''Gertrude Stein'''

Physical solitude, or mental (which can be worse in a crowd) -- and its causes, and its consequences.

A total lack of human contact can leave the character isolated even if surrounded by non-humans; and sometimes they have to be specific kinds of humans, and sometimes, no one can keep them from feeling isolated.

Compare IntroversionTropes. Contrast {{Ensembles}}, PowerTrio and DuoTropes. See TheSinglesIndex, which deals with romantic solitude.
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!!Tropes
[[index]]
* AloneAmongTheCouples: A character with no loved one is surrounded by those with loved ones.
* AloneInACrowd
* TheAloner
* AloneWithPrisonerPloy
* AloneWithThePsycho
* AttractivenessIsolation
* CantLiveWithThemCantLiveWithoutThem
* CityInABottle
* DarkMagicalGirl
* TheDrifter: A character that WalkingTheEarth
* DyingAlone
* EatingLunchAlone
* FigureItOutYourself
* FriendlessBackground
* GoMadFromTheIsolation
* HatesBeingAlone
* HeadphonesEqualIsolation
* TheHermit: A character lives in solitary and likes it like that.
* HermitGuru
* HeroicNeutral: A character wants to be alone and have nothing to do with anyone else.
* HiddenElfVillage
* {{Hikikomori}}
* IJustWantToHaveFriends
* ImNotHereToMakeFriends
* InTheEndYouAreOnYourOwn
* IneffectualLoner: A character's solitary nature is not enough.
* InformedLoner
* IntelligenceEqualsIsolation
* ItsUpToYou
* IWorkAlone: One character can do the work of five. Usually a OneManArmy if they are a {{Badass}}.
* JunglePrincess
* AKindOfOne
* KnightErrant
* TheLastManHeardAKnock
* LastOfHisKind
* LeaveHimToMe
* LeaveMeAlone
* LeaveTheTwoLovebirdsAlone
* LonelyAtTheTop
* LonelyDollGirl
* LonelyRichKid
* LonelyTogether
* LonersAreFreaks
* LonerTurnedFriend
* MaddenIntoMisanthropy
* MinorLivingAlone
* MisunderstoodLonerWithAHeartOfGold
* NatureHero
* NoSocialSkills
** NotGoodWithPeople
* OnePersonBirthdayParty
* OneRiotOneRanger
* TheOnlyOne
* OrphansOrdeal
* ParentalAbandonment
* RememberThatYouTrustMe
* {{Robinsonade}}
* SingleSpecimenSpecies
* SmallSecludedWorld
* SolitarySorceress
* SoloSequence
* SurvivorGuilt
* ThereIsAnother
* TheyreCalledPersonalIssuesForAReason
* ThisIsSomethingHesGotToDoHimself
* TraumaSwing
* UniquenessValue
* UsedToBeMoreSocial
* WildChild: A character that was born and raised in the wilderness.
* TheWorldMocksYourLoss
* ZenSurvivor
[[/index]]
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''Quite a crowd of them, isn't there?''
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