-> ''Books are the ultimate Dumpees: put them down and they’ll wait for you forever; pay attention to them and they always love you back.''
--> — '''Colin'''

''An Abundance of Katherines'' is a young adult novel written by Creator/JohnGreen. It tells the story of Colin, a recent high school graduate whose girlfriend Katherine has just dumped him. This is made even more traumatic because Colin has dated no fewer than ''19'' girls named Katherine, all of whom dumped him [[spoiler: except for Katherine the Third]].

Colin's [[BlackBestFriend Middle-Eastern Best Friend]], Hassan, talks him into going on a road trip to take his mind off the pain of losing yet another Katherine. They end up in a small town known as Gutshot, Tennessee, and quickly find themselves at the home of a woman who runs a textile factory which manufactures tampon strings (which is the main source of income for the town). She has a daughter named Lindsey, who is smart and funny and has "a smile that could stop wars and cure cancer," but (1) Colin is definitely not interested and (2) Lindsey already has a boyfriend (named Colin) [[note]]Colin is fond of numbered lists in the middle of sentences[[/note]]. Colin and Hassan quickly become friends with Lindsey and start having all sorts of strange adventures.
!!Contains examples of:
* AmbiguousDisorder: Colin, who has an excellent memory and can make connections in everything he reads. Socially, he is so challenged that Hassan needs to tell him when he's boring other people. He obsesses over the name "Katherine" in general and K-19 in particular for much of the book, indicating that he has trouble adjusting to new situations.
* AppliedMathematics: Colin's attempts at graphing his relationships with the Katherines. The longest equation contains the variables age (A), Popularity Differential (C), Attractiveness Differential (H), Dumper/Dumpee Differential (D), and Introvert/Extrovert Differential (P).
* AsLongAsItSoundsForeign: Averted. The book contains a good number of different languages, all of which are completely correct grammatically and otherwise.
* BeeAfraid: Making a [[MakesSenseInContext feral pig hunting trip]] even worse.
* ChildProdigy: Colin
* ComingOfAgeStory
* FatAndProud: Hassan
* FirstGirlWins: Played with. [[spoiler: We see Katherine XIX. We see Katherine I. About halfway through the book, it's revealed that they are one and the same.]] On a normal timeline of the story, it is subverted because [[spoiler: Katherine XIX]] dumps Colin, but since some of the events are revealed out of order it has a zig-zagged effect.
** Also played straight: [[spoiler: While visiting the tampon factory, Colin meets an attractive girl named Katherine--but he's already decided he's fallen in love with Lindsey.]]
* FootnoteFever: The book contains a large number of footnotes, usually containing strange-but-true facts that are irrelevant to the story [[note]]but [[RuleOfCool still cool]]. The fact that they're written in the same narrative style and perspective as the rest of the story [[RuleOfFunny also makes it work]][[/note]]
* ForeignCussWord: In order of appearance: ''sitzpinkler'' (German: wimp/a man who sits to pee), ''kafir'' (Arabic: infidel), ''merde'' (French: shit), and ''paardenlul'' (Dutch: horse's penis).
* GagPenis: Hassan claims to have one. Since he's saving himself for marriage, the truth of the matter remains unknown.
* GeekyTurnOn: Sort of. Colin's "type" is "not physical but linguistic". He likes Katherines. No nicknames or alternative spellings.
* [[GoodParents Good Parent]]: Hollis, Lindsey's mom.
* {{Goth}}: Lindsey, in eighth grade.
* HasAType: Colin for Katherines.
* HomeschooledKids: Colin, until first grade. Hassan, until high school.
* ICallHimMisterHappy: Hassan. Thunderstick. That is all.
* InherentlyFunnyWords: Sphincter.
* MametSpeak: Most notably in the cave scene.
* MookFaceTurn: JATT and SOCT.
* MouthfulOfPi: Colin.
* NotSoDifferent : [[spoiler: Colin is shocked to find out that he is also a Dumper after he phones Katherine the Third to recall their brief relationship, who tells him that ''he dumped her''. Prior to the phone conversation, Colin had spent most of the book angsting over the fact that he was a Dumpee.]]
* OddNameOut : [[spoiler: Out of all the girlfriends that Colin's ever had so far , Lindsey winds up being the only one (and the first) who is not called Katherine at the end of the book.]]
* {{Omniglot}}: Colin, to an extent. Justified in that he's a child prodigy who learned many of the languages at a very young age.
* OneSteveLimit: Averted, obviously.
* OnlyKnownByTheirNickname: Colin and Hassan refer to Lindsey's boyfriend as "TOC" (The Other Colin); her other friends are JATT (Jeans Are Too Tight) and SOCT (Short One Chewing Tobacco).
* PairTheSpares: Hassan and Katrina, Lindsey's only female friend. [[spoiler:They break up when Colin and Hassan catch Katrina cheating with TOC.]]
* RoadTripPlot
* RomanticFalseLead: The Katherines, of course, for Colin. [[spoiler:And TOC for Lindsey.]]
* SerialRomeo: Maybe not every week, but Colin has dated more girls named Katherine than he's had years in his life.
* ShoutOut: A John Green book where [[Literature/PaperTowns the main character makes numbered lists]] and [[Literature/LookingForAlaska is on an extended road trip launched by love?]]
* ShownTheirWork: The Hardcover Edition features an appendix where John Green (with the help of a Ph.D mathematician!) actually works out Colin's love formulas.
* SignificantAnagram: [[spoiler:When Colin discovers Archduke Franz Ferdinand is an anagram of Fred N. Dinzanfar Lindsey's great-grandfather]]
* TeenGenius: Colin worries that he isn't one. "Prodigies learn. Geniuses do."
* TranslationConvention: Averted. The dialogue is in Arabic and German at times [[note]] with footnotes translating them.[[/note]]
* UnusualChapterNumbers: Occasionally, but always within conventional chapters, with the exception of [[spoiler:(epilogue, or the lindsey lee wells chapter)]]. They take the form of '''The End (of the End)''' and '''The Middle (of the Beginning)'''. Also, there are as many numbered chapters as there are Katherines.
* UnusualEuphemism: Fug, an obvious stand-in for a certain word. [[LampshadeHanging Lampshaded]] by Lindsey and explained by Colin, in-universe.
* WhenSheSmiles: Lindsey. [[PunctuatedForEmphasis So. Very. Much.]]
* WritersCannotDoMath: The author had someone else (Professional Mathematician Daniel Biss) come up with the mathematical formulas in the book, but a few mistakes still slipped through.
''An Abundance of Katherines'' was a 2007 Michael L. Printz Award Honor Book. When author John Green received news of this, he proceeded to do his happy dance. This footage can be found on Youtube.