Here are 40 book genres and subgenres worth writing in, grouped under their parent genre. Each one has a single line on what readers expect from it and a premise seed you can take and run with.
Why subgenres instead of plain "fantasy" or "romance"? Because readers shop by subgenre. Nobody walks into a bookshop wanting "a mystery". They want a cozy mystery with a bakery, or a police procedural with a tired detective. The narrower your genre, the easier it is to know what to write and who to sell it to.
If you want complete ideas rather than genres, 50 AI book ideas by genre has fuller premises, and the free book idea generator will make more on demand.
What are the main fantasy subgenres?
Fantasy is any story where magic or the impossible is real inside the world. These six subgenres cover most of what sells. If you are starting one, write a fantasy novel shows how BookZeta handles the setup.
- Epic fantasy. Big world, large cast, the fate of kingdoms at stake. Seed: the heir to the throne is the only person who knows the prophecy was forged.
- Urban fantasy. Magic hidden inside a modern city. Seed: a building inspector's job is certifying which apartments are safe from what lives in the walls.
- Cozy fantasy. Low stakes, warm community, found family, no war. Seed: a retired battle mage opens a tea shop and keeps getting asked for help anyway.
- Grimdark. Brutal, morally grey, nobody gets out clean. Seed: a mercenary company is paid by both sides of a siege and has to decide which contract to break.
- Portal fantasy. Someone from our world falls into another. Seed: a nurse keeps waking up in a world where she is the only healer, and her shifts there are getting longer.
- Romantasy. A fantasy plot and a romance plot, each carrying equal weight. Seed: two rival court spies are ordered to fake an engagement to catch a traitor.
What are the main science fiction subgenres?
Science fiction asks "what if" about technology, space or society, and then follows the consequences. Write a sci-fi novel covers building one on BookZeta.
- Space opera. Starships, empires, adventure on a big canvas. Seed: a cargo pilot inherits a debt owed to the galaxy's most feared admiral.
- Cyberpunk. High tech, low life, corporations running everything. Seed: a memory courier discovers the file she is carrying is her own childhood.
- Dystopian. A society gone wrong, seen from inside. Seed: in a city where every citizen is ranked daily, the lowest-ranked person gets a mysterious promotion.
- Hard science fiction. The science has to hold up. Seed: a crew of six has to fix a failing reactor with nothing but what is on board and a 40-minute signal delay.
- Solarpunk. Hopeful futures built on community and sustainable technology. Seed: a town that runs on shared solar power has to decide whether to let a corporation in.
What are the main mystery, thriller and crime subgenres?
Mystery asks who did it, thriller asks whether the hero will stop it in time, and crime is often told from the wrong side of the law. Write a mystery or thriller is the place to start one.
- Cozy mystery. Amateur sleuth, small town, no graphic violence. Seed: the winner of the village baking contest dies, and every judge had a motive.
- Police procedural. The investigation as the detectives actually run it. Seed: a detective's cold case reopens when a DNA match points at her own father.
- Psychological thriller. Unreliable minds, domestic secrets, twists. Seed: a woman finds her own handwriting in a diary she has never seen.
- Legal thriller. Courtrooms, lawyers, justice versus the rules. Seed: a public defender realizes her client is innocent and that the real killer is her other client.
- Heist. A crew, a plan, and the plan going wrong. Seed: a team of retired thieves breaks into a museum to return something they stole forty years ago.
- Noir. Cynical, shadowy, morally compromised heroes. Seed: a disgraced reporter is hired to find a missing singer who does not want to be found.
What are the main romance subgenres?
Romance is any story where the central plot is a relationship and the ending is happy. Readers treat that ending as a promise. See write a romance novel to start one.
- Contemporary romance. Present day, real-world stakes. Seed: two single parents keep getting paired up as chaperones on every school trip.
- Historical romance. Love story set in the past, often Regency or Victorian. Seed: a governess is hired by the man whose family ruined hers.
- Romantic comedy. Banter, misunderstandings, a lot of laughs. Seed: a wedding planner and a divorce lawyer share an office and a receptionist.
- Romantic suspense. Love story plus danger. Seed: a witness in protective custody falls for the marshal who is sure someone inside leaked her address.
- Paranormal romance. Love story with ghosts, shifters or vampires. Seed: a woman renovating an old inn keeps getting design advice from the ghost who built it.
What are the main horror subgenres?
Horror exists to frighten, and the subgenre decides what kind of fear.
- Gothic horror. Old houses, family secrets, dread over shock. Seed: a woman inherits a manor on the condition that she never opens the east wing.
- Folk horror. Isolated communities, old rituals, the land itself. Seed: a village holds a harvest festival every seven years, and this year the outsider has been invited.
- Cosmic horror. Things too large and too old to understand. Seed: a deep-sea survey picks up a sound that matches a lullaby every crew member's mother sang.
- Haunted house. A place that does not want you there. Seed: a family buys their dream home and finds the previous owners never moved out.
What are the main historical and literary genres?
Historical and literary fiction trade on character, setting and prose rather than genre machinery.
- Historical fiction. Real periods, invented or lesser-known lives. Seed: a codebreaker in 1943 decodes a message addressed to her by name.
- Alternate history. One event goes differently and history changes. Seed: the Library of Alexandria never burned, and it is now the most powerful institution on Earth.
- Literary fiction. Character and language first, plot second. Seed: three estranged siblings meet to empty their mother's house and find she kept every letter they never sent.
- Book club fiction. Accessible, emotional, built to be discussed. Seed: a woman receives a wrong-number text from someone planning to leave their marriage, and texts back.
- Family saga. Several generations, one family, a long span of time. Seed: four generations of women run the same restaurant, and each one hides a different recipe from the next.
What are the main adventure subgenres?
Adventure is movement and danger: a journey, a hunt, a race against the clock. Write an adventure novel covers setting one up.
- Action adventure. Physical stakes, fast pace, set pieces. Seed: a stunt double is mistaken for the actor she replaces and kidnapped on location.
- Survival. People against nature and each other. Seed: seven strangers survive a plane crash in the Arctic and realize one of them caused it.
- Treasure hunt. A map, a race, rivals on your heels. Seed: a grandmother's recipe book turns out to be a coded map to a sunken ship.
- Western. Frontiers, law and lawlessness. Seed: a new sheriff arrives in town and learns she was hired to lose.
Which crossover genres are worth trying?
Some of the most interesting shelves sit between the big genres. These five mix well with almost anything above.
- Magical realism. One impossible thing in an otherwise ordinary world, treated as normal. Seed: in a small town, everyone's shadow leaves them for one day a year.
- Coming-of-age. A young person becomes who they are. Seed: a teenager spends one summer covering her late brother's paper route and meets everyone he knew.
- Dark academia. Elite schools, obsession, secrets. Seed: a scholarship student joins a classics society whose last five presidents all vanished after graduation.
- Satire. Exaggeration aimed at something real. Seed: a startup sells the right to be forgotten, and then forgets its own founder.
- Speculative fiction. A single "what if" played straight, without the full science fiction machinery. Seed: people can hear each other's thoughts for one hour a day, and everybody knows which hour.
Is YA a genre?
No. Young adult, middle grade and adult are age categories, not genres. You can write YA fantasy, YA mystery or YA romance, and each follows its genre's rules while pitching the voice, protagonist age and content to the reader. The age category also changes the expected length, which how long should a book be covers by genre and age.
How do you pick a genre to write?
Pick the genre you read most. You already know its rules, its rhythms and what disappoints you in it, which is most of what writing it well requires.
Three quick tests if you are torn:
- Which shelf would you put it on? Name three published books yours would sit beside. Whatever they are shelved as is your genre.
- Which ending are you writing toward? A happy couple is romance. A solved crime is mystery. A survived horror is horror. The ending usually decides the genre for you.
- Can you narrow it once more? "Fantasy" is too broad to write toward. "Cozy fantasy set in a tea shop" is a book.
Narrowing also improves AI drafts. When you start a project on BookZeta you pick a genre and sub-genres, and the more precisely you narrow them the less generic the draft becomes. Genres and audiences explained shows how those choices steer what gets written.
Found one you want to write? Start your book with that premise, or run a few more through the book idea generator first.
