The short story is a literary genre of fictional prose narrative that tends to be more concise and to the point than longer works of fiction such asnovellas (in the modern sense of the term) and novels.

Short stories have their origins in oral story-telling traditions and the prose anecdote, a swiftly-sketched situation that quickly comes to its point. With the rise of the comparatively realistic novel, the short story evolved as a miniature version, with some of its first perfectly independent examples in the tales of E.T.A. Hoffmann. Other nineteenth-century writers well-known for their short stories are Nathaniel Hawthorne, Herman Melville, Edgar Allan Poe, Nikolai Gogol, Guy de Maupassant, Bolesław Prus and Anton Chekhov.

Short stories were a staple of early-19th-century magazines and often led to fame and novel-length projects for their authors. More recently, short stories have been reprinted in anthologies, categorized by topic or critical reception. Today many authors release collections of their short stories.

Some authors are known almost entirely for their short stories, either by choice (they wrote nothing else) or by critical regard (short-story writing is thought of as a challenging art). An example is Jorge Luis Borges, who won American fame with "The Garden of Forking Paths," published in the August 1948 Ellery Queen's Mystery Magazine. Another example is O. Henry (author of "Gift of the Magi"), for whom the O. Henry Award is named.

Authors such as Kurt Vonnegut, Nathaniel Hawthorne, Bolesław Prus, F. Scott Fitzgerald, P.G. Wodehouse and Ernest Hemingway were highly accomplished writers of both short stories and novels.

Short stories have often been adapted for half-hour and hour radio dramas, as on NBC Presents: Short Story (1951-52).

Short stories tend to be less complex than novels. Usually a short story focuses on only one incident, has a single plot, a single setting, a limited number of characters, and covers a short period of time.

In longer forms of fiction, stories tend to contain certain core elements of dramatic structure: exposition (the introduction of setting, situation and main characters); complication (the event that introduces the conflict); rising action, crisis (the decisive moment for the protagonist and his commitment to a course of action); climax (the point of highest interest in terms of the conflict and the point with the most action); resolution (the point when the conflict is resolved); and moral.

Because of their length, short stories may or may not follow this pattern. Some do not follow patterns at all. For example, modern short stories only occasionally have an exposition. More typical, though, is an abrupt beginning, with the story starting in the middle of the action (in medias res). As with longer stories, plots of short stories also have a climax, crisis, or turning point. However, the endings of many short stories are abrupt and open and may or may not have a moral or practical lesson. As with any art form, the exact characteristics of a short story will vary by author

Determining what exactly separates a short story from longer fictional formats is problematic. A definition of a short story is that one should be able to be read it in one sitting, a point most notably made in Edgar Allan Poe's essay "The Philosophy of Composition" (1846). Other definitions place the maximum word length at 7,500 words. In contemporary usage, the term short story most often refers to a work of fiction no longer than 20,000 words and no shorter than 1,000. Stories less than 1,000 words are usually referred to either as "short short fiction" or "short shorts.".