Fritz Leiber (1910 - 1992) was an American writer of {{fantasy}}, {{horror}} and ScienceFiction, best known for his fantasy series ''Literature/FafhrdAndTheGrayMouser'', and for creating the term "Sword and Sorcery".

His other works include the contemporary fantasy novel ''Conjure Wife''; the science fiction novel ''The Wanderer''; and the TimeTravel ''Change War'' series which included the acclaimed short novel ''The Big Time''.

He was given a lifetime-achievement UsefulNotes/WorldFantasyAward in 1976, and was elected a [[UsefulNotes/DamonKnightMemorialGrandMasterAward Grand Master of Science Fiction]] in 1981.

!!Works by Fritz Leiber with their own trope pages include:

* ''Literature/FafhrdAndTheGrayMouser''
* [[Literature/DangerousVisions "Gonna Roll The Bones"]]

!!Other works by Fritz Leiber provide examples of:

* AlternateHistory: Happens a lot in the Change War series.
* ArmyOfTheAges: The premise of the Change War stories.
* BrownNote: "Rump-Titty-Titty-Tum-TAH-Tee" is about the discovery of a waltz rhythm that causes anyone who hears it to become maniacally obsessed with it, listen for other examples of it, and recreate it at every opportunity.
* CatGirl: ''The Wanderer'' has a Sexy Alien Catgirl from a Superior Species teach the hero about Sexy Catgirl Sex. It's notable that this is a Western novel from the 1960s.
* EarWorm: An in-universe example is at the center of the story "Rump-Titty-Titty-Tum-TAH-Tee".
* EndlessWinter: In the short story ''A Pail of Air'', the Earth is ripped away from the Sun by a passing black hole. As a result of losing the heat of the Sun the Earth has gotten so cold that the atmosphere has frozen.
* {{Fembot}}: The robot population in "The Silver Eggheads" is divided into males and females because it turns out to be very beneficial to robotic mental health to be able to have sex -- robotic sex, which entails sharing power on the same circuit. They don't have to do this by an exacting emulation of human sex, but that's the way it works out culturally.
* FeudalFuture: In ''Gather, Darkness!'' a super-scientific elite run the world in the guise of a CorruptChurch sustained by high-tech miracles, and keep everyone else as uneducated peasants. They are opposed by an underground of witches using equally super-tech magic.
* ForeverWar: The Change War, a war of time travellers between "the Spiders" and "the Snakes." The two sides span galaxies and species as well as ages, and no one, at least no one the reader meets, knows what the war is about. Both sides are trying to redesign the history of the universe, but no one knows to what end, nor does the war appear to even have a history.
* HilariousInHindsight: Mitt Romney only wishes that he had the binder full of women that Dr. Slyker sports in short story, ''A Deskful of Girls''.
* InterspeciesRomance: ''The Wanderer'' included romance with an off-world female from a feline race. Think serious scratches down the back.
** Definitely a subject of AuthorAppeal, as there's quite a lot of it. Cat women, fish women, ghost women -- there are a lot of different types of not-entirely-normal women in Leiber's work.
* LaserBlade: The "rods of wrath" in ''Gather Darkness'' (1943) are possibly the UrExample.
-->"Like two ancient swordsmen, then, the warlock and the deacon dueled together. Their weapons were two endless blades of violet incandescence, but their tactics were those of sabers -- feint, cut, parry, swift riposte."
* MerlinSickness: In "The Man Who Never Grew Young", it happens to everyone except the immortal title character and history itself runs backwards.
* NecroNonSequitur: "Try and Change the Past", in which a Time Soldier tries to use his tools to prevent his own past death. (Time Soldiers are recruited just before the moment of their death, but, for handwaved reasons, remember dying.) He goes back and prevents himself from being shot, only to see his past self, with a look of despair, pick up the gun and shoot himself. So he goes back again and disables the gun, only to see his past self hit by a bullet-sized meteorite in exactly the same place the bullet struck in the previous two deaths. At which point he understandably gives up.
* NoCelebritiesWereHarmed: All human chess players in "The Sixty-Four Square Madhouse" are plays off the names of grandmasters active at the time (e.g. William Angler for [[ Robert Fischer]], Vasilly Krakatower for [[ Savielly Tartakower]], etc.).
* NonLinearCharacter: The title character in ''The Dealings of Daniel Kesserich'' gains this ability as a side effect of messing with time travel.
* OntologicalInertia: Codified in the Change War series as the Law of Reality Conservation: "Anything in existence will continue to exist until a sufficient force acts against it."
* OurNudityIsDifferent: In "Coming Attraction", being topless is fine for a woman... so long as she wears a mask.
* PickYourHumanHalf: ''The Silver Eggheads'' has Miss Willow, a "femiquin" (robot prostitute) who looks but doesn't act human, and the robot lovers Zane Gort and Miss Phyllis Blushes, who act but don't look human. The dichotomy is rationalized by Zane, who tells the human hero that, if you tried to cram all the AI circuitry of a real robot like himself into the same chassis with all the human-mimicry devices of a femiquin, the result would have to be 10 feet high or as fat as a circus fat lady.
* RecursiveAdaptation: Leiber adapted ''Tarzan and the City of Gold'' starring Mike Henry into a prose {{Tarzan}} novel. He took pains to footnote past Tarzan adventures by Creator/EdgarRiceBurroughs to make this a canonical continuation of the Tarzan continuity of Burroughs.
* RobotNames: ''The Silver Eggheads'' has multiple examples.
* TimeTravel: Especially in the Change War series.
* WomensMysteries: ''Conjure Wife'' relates a college professor's discovery that his wife (and all other women) are regularly using magic against one another and their husbands. The story is set in the real world around the idea that women practice magic but not only keep it secret from all men but almost from themselves, as they just act as if it really isn't anything important but just superstitious meaningless acts, like not walking under a ladder.
* ZeppelinsFromAnotherWorld: ''Catch That Zeppelin!'' is about an alternate universe where things turned out (mostly) much better than our own, and includes the subtrope of zeppelins docking at the Empire State building, where a Real Life mooring mast was considered. Needless to say, they didn't use hydrogen to lift them.