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''Professor Unrat, oder Das Ende eines Tyrannen''' (translated as "Professor Unclean, Small Town Tyrant"), is a 1905 novel by German author Heinrich Mann about a despotic teacher.

The book caricatures the middle and upper class educational system of [[UsefulNotes/ImperialGermany Wilhelmine Germany]] and the double standards of the title character. In the United States, an abridgment of the English translation was published in 1932 under the title ''[[MarketBasedTitle The Blue Angel]]''.

The novel served as the basis for the 1930 film ''Film/TheBlueAngel''.

!!This novel provides examples of:
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%%* AppropriatedAppellation: Unrat's nickname, after he gains dubious power over the town.
* BrilliantButLazy: Lohmann, who slacks off studying and educates himself instead, but still would get good grades if Unrat graded him justly.
* DespotismJustifiesTheMeans: For Unrat, ruining the former disobedient students is worth ruining his own fortune and allowing his wife to cheat on him.
%%* DevotedToYou: Ertzum to Rosa.
* EmbarrassingNickname: The basis of the Professor's mania, hatred and tyranny towards his students is the nickname "Unrat" ("Garbage"), which is completely justified in-universe: he is described as very ugly, disheveled, prematurely aged, rather incompetent and a failure in anything including his own former marriage.
%%* FieryRedhead: Rosa.
%%* ForbiddenFruit: Lohmann for Rosa.
%%* ILoveYouBecauseICantControlYou: Rosa for the immune Lohmann.
%%* InLoveWithLove: Lohmann.
* LovingAShadow: Ertzum, loving Rosa for reminding him of a peasant girl, who made him a man.
* MarriedToTheJob: Unrat to the school, later to seizing power on the town.
* NouveauRiche: The reason for which the wealthy men of the town are so easily ensnared and swindled in Unrat's gambling ring.
%%* ReallyGetsAround: Rosa.
* SadistTeacher: Unrat is a petty tyrant who hates all of his students, and delights in punishing them or giving them bad grades.
* SleepsWithEveryoneButYou: Rosa is a cheap hooker but she wouldn't be with Ertzum for his whole inheritage. Justified in-universe by the fact Ertzum--despite his aristocratic standing--is extremely stupid and boorish, so stupid he makes the Professor appear brilliant by comparison.
%%* TheTrickster: Kieselack.
%%* UnholyMatrimony: Unrat and Rosa.
%%* UpperClassTwit: Von Ertzum is a Count.
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