A swashbuckler is a genre of European adventure literature that focuses on a heroic protagonist stock character who is skilled in swordsmanship, acrobatics, and guile, and possesses chivalrous ideals. Swashbuckler protagonists are heroic, daring, and idealistic. They rescue damsels in distress, protect the downtrodden, and use duels to defend their honor or that of a lady or to avenge a comrade.

Swashbucklers often engage in daring and romantic adventures with bravado or flamboyance. Swashbuckler heroes are typically gentleman adventurers who dress elegantly and flamboyantly in coats, waistcoats, tight breeches, large feathered hats, and high leather boots, and they are armed with the thin rapiers that were commonly used by aristocrats.

Swashbucklers are not usually unrepentant brigands or pirates, although some may rise from such disreputable stations and achieve redemption. His opponent is typically characterized as a dastardly villain. While the hero may face down a number of henchmen to the villain during a story, the climax is a dramatic one-on-one sword battle between the protagonist and the villain. There is a long list of swashbucklers who combine courage, skill, resourcefulness, and a distinctive sense of honor and justice, as for example Cyrano de Bergerac, The Three Musketeers, The Scarlet Pimpernel, Robin Hood, and Zorro.

As a historical fiction genre, it is often set in the Renaissance or Cavalier era. The stock character also became common in the film genre, which extended the genre to the Golden Age of Piracy. As swashbuckler stories are often mixed with the romance genre, there will often be a beautiful, aristocratic female love interest to whom the hero expresses a refined, courtly love. At the same time, since swashbuckler plots are often based on intrigues involving corrupt religious figures or scheming monarchs, the heroes may be tempted by alluring femmes fatales or vampish courtesans.

"Swashbuckler" is a compound of "swash" (archaic: to swagger with a drawn sword) and "buckler" (a small shield gripped in the fist) dating from the 16th century.

While man-at-arms and sellswords of the era usually wore armor of necessity, their counterparts in later romantic literature and film (see below) often did not, and the term evolved to denote a daring, devil-may-care demeanor rather than brandishment of accoutrements of war. Swashbuckling adventures and romances are generally set in Europe from the late Renaissance up through the Age of Reason and the Napoleonic Wars, extending into the colonial era with pirate tales in the Caribbean.

Jeffrey Richards traces the swashbuckling novel to the rise of Romanticism, and an outgrowth of the historical novel, particularly those of Sir Walter Scott, "... medieval tales of chivalry, love and adventure rediscovered in the eighteenth century". This type of historical novel was further developed by Alexandre Dumas.

John Galsworthy said of Robert Louis Stevenson's 1888 swashbuckling romance, The Black Arrow, that it was "a livelier picture of medieval times than I remember elsewhere in fiction." Anthony Hope's 1894 The Prisoner of Zenda initiated an additional subset of the swashbuckling novel, the Ruritanian romance.