Mercedes Lackey is a prolific author of {{fantasy}} and UrbanFantasy literature, as well as a lyricist, songwriter, and [[FilkSong filk singer]]. She started out as a {{fanfic}} writer.

She sometimes writes with other authors, including her husband, Larry Dixon, who also illustrates her work.

When not creating, Lackey works as a wild bird rehabilitator in Oklahoma, and owns several parrots. Falconry and other avian pursuits, as well as equestrianism, are therefore [[AuthorAppeal common themes in her work]].

She was also an avid player of ''Videogame/CityOfHeroes'', devoting a lot of time and effort to saving the game from cancellation.
!!A ''very incomplete'' list of her works includes:
* Numerous books, organized into trilogies, sub-series, and stand-alone novels, in a fantasy world of her own devising named Velgarth; most of them focus on the kingdom of Valdemar and its allies. Called the ''Literature/HeraldsOfValdemar'' series on this wiki, for lack of a better term. In roughly in-universe chronological order:
** ''The Mage Wars'' trilogy, which describes events in the prehistory of the setting.
** The ''Literature/LastHeraldMageTrilogy''
** ''The Collegium Chronicles'' and ''The Herald Spy'', the most recently published series.
** ''Brightly Burning'', a standalone novel detailing the story of Lavan Firestorm, a historical character mentioned in the ''Arrows'' trilogy.
** The ''Vows and Honor'' series, two novels and a collection of short stories featuring Tarma and Kethry, based on Lackey's earliest published works.
** ''Exile's Honor'' and ''Exile's Valor'', two prequel novels about a defector who becomes Valdemar's Weaponsmaster.
** ''To Take a Thief'', a prequel novel about a street thief-turned-Herald. Forms a rough trilogy with the ''Exile'' books.
** The ''Arrows'' trilogy, the first published novels set in Valdemar proper.
** ''By The Sword'', a novel linking ''Vows and Honor'' with the main Valdemaran series.
** The ''Mage Winds'' trilogy
** The ''Mage Storms'' trilogy
** The ''Darian's Tale'' or ''Owl'' trilogy

* Several albums of music, mostly inspired by Valdemar:
** ''Heralds, Harpers and Havoc'' (1988): Songs inspired by the ''Arrows'' trilogy.
** ''Magic, Moondust, and Melancholy'' (1989): Includes two songs related to the ''Vows and Honor''/''By the Sword'' books.
** ''Oathbound'' (1990): Songs from the book of the same name.
** ''Oathbreakers'' (1991) likewise
** ''Shadow Stalker'' (1994): Songs from ''The Last Herald Mage''.
** ''By the Sword'' (1994): Songs from the book of the same name.
** ''Lovers, Lore, and Loss'' (1995): More songs about the ''Arrows'' trilogy.
** ''Owlflight'' (2000): Based on the ''Owl'' trilogy.
** ''Sun and Shadow'' (2000): Songs about the legendary Sunsinger and Shadowdancer.

* Four Urban Fantasy series, all of which take place in the same universe:
** The Literature/DianaTregarde series, three horror/urban fantasy novels featuring romance novelist/magical Guardian Diana Tregarde.
** The ''[=SERRAted Edge=]'' books, involving elves, car racing, and lots of child abuse.
** The ''Bedlam's Bard'' books, which follow the development of a very powerful Bard; he also associates with elves a lot.
** The Elizabethan series ''The Doubled Edge'', which is the backstory of the elven politics in the ''Serrated Edge'' and ''Bedlam's Bard'' series, and is a retelling of the life of Queen Elizabeth from her birth to her crowning, and her association with the elves.

* The ''Literature/ElementalMasters'' series, about hidden mages in post-Victorian England (with one set in California). These are based somewhat loosely on fairy tales.
* The ''Fairy Tales'' series, which are retellings of not-in-the-common-lexicon mythological stories.
** ''[[Literature/FirebirdLackey Firebird]]''
** ''Literature/TheBlackSwan'' (''Theatre/SwanLake'' from Odile's point of view)
* The ''Literature/DragonJousters'' novels: A series involving a world based on Bronze Age Egypt, where persons who can tame and [[DragonRider ride]] the wild dragons of the land are sort of the ultimate weapon. The main character is a dragon tamer named Kiron (AKA Vetch). Novels in this series:
** '' Joust'' (2003)
** '' Alta'' (2004)
** '' Sanctuary'' (2005)
** '' Aerie'' (2006)
* ''Literature/BardicVoices'', a fantasy series about a group called "The Free [[TheBard Bards]]," essentially the non-union alternative to their world's Bardic Guild; some of them also have MagicMusic. This was based on her writing the novelization of the original ''[[VideoGame/TheBardsTaleTrilogy Bard's Tale]]'' video game; she wanted to expand on the MagicMusic idea.
* ''Sacred Ground'', about a Cherokee and Osage private investigator Jennifer Talldeer, who as an apprentice shaman is known as Kestrel-Hunts-Alone.
* ''If I Pay Thee Not in Gold'', co-written by Piers Anthony, about a world whose magic powers change hands and natures every few generations, just long enough for most people to forget that society was ever different. Those with the magic of course make the rules, and in the heroine's country it's in the hands of women, hence a matriarchal society where most men are slaves. There are other magical races as well, including a race of "demons" who change gender when they have sex, and die if their partner is unfaithful.
* ''Literature/TheObsidianTrilogy'', a fantasy trilogy done in conjunction with Creator/JamesMallory about a coming war with demons. Later they released ''Literature/TheEnduringFlameTrilogy'', set a thousand years later. Currently they are writing the ''Literature/DragonProphecyTrilogy'', about Elven Queen Vielissiar Faricarnon, mentioned in the previous trilogies as the first to face demons in battle and bond with a dragon. The first book is the only one out so far.
* ''Literature/TalesOfTheFiveHundredKingdoms'', a romantic series set in a world governed by the [[TheoryOfNarrativeCausality Tradition]], a magical force that causes certain people's lives to follow folkloric motifs (Cinderella, Snow White, etc.) Much of the humor and conflict arises from the fact that the protagonists are often [[GenreSavvy aware of the Tradition]], and the truly skilled can deliberately invoke whichever tale or aspect of a tale will help them out of a tight spot.
* ''Literature/WingCommander: Freedom Flight'' (with Creator/EllenGuon), the first novel based on the ''Wing Commander'' franchise. One of her few licensed novels, and the only one which stuck closely to the themes of the original game (the remainder, written primarily by a well-known military fiction author and conservative pundit, veer far more toward traditional MilitaryScienceFiction).
* ''Literature/TheHalfbloodChronicles'' (with Creator/AndreNorton), a fantasy trilogy.
* ''Literature/TheHeirsOfAlexandria'', a HistoricalFantasy series with Creator/EricFlint and Creator/DaveFreer.
* ''Literature/TheShipWho Searched'' (with Creator/{{Anne McCaffrey}})
* ''Literature/{{Gwenhwyfar}}: The White Spirit'': her take on Arthurian legend, told from the perspective of Arthur's queen.
* ''Literature/ShadowGrail'' series with Creator/RosemaryEdghill, about Spirit White, a teenager who has lost her family in an accident and is sent to [[WizardingSchool Oakhurst Academy]], where all the students have magical powers.
* ''[[Comicbook/RedSonja Legends of Red Sonja]]'': Contributor to a comic book anthology celebrating Red Sonja's 40th anniversary.
* ''The One Dozen Daughters'': A fantasy series written with James Mallory about twelve princesses from a tiny kingdom that can't afford twelve royal dowries, so they must all leave the country to seek their own fortunes on their eighteenth birthday. The first book, about the oldest princess Clarice, is out so far.
* ''Secret World Chronicle'': A series inspired by ''City of Heroes'', about a world where superheroes are common seeking to stop an invasion of supervillains from another world.
* She has contributed short stories to the ''Literature/SixteenThirtyTwo'' SharedUniverse, including one that started fleshing out the character Tom Stone, who becomes much more prominent as the series continues.
* The ''Hunter'' trilogy, with the first two books out so far, of a dystopian future Earth, where otherwordly creatures, most with some basis out of various myths and legends, appear and attack the world (most likely due to some Christians setting off a nuke in attempt to kickstart the Apocalypse). Hunters, or those born with some kind of magic, are normally recruited and trained by the capital, Apex City, to fight the monsters, known as Othersiders, with the aid of their Hounds, supernatural creatures that allied with the humans. The trilogy focuses on a young Hunter named Joyeaux Charmand.