A series of side-scrolling {{platform game}}s developed by Creator/{{Sega}} and [[Creator/WestoneBitEntertainment Westone]]. Originally began as a trilogy of thematically-related arcade games (''Wonder Boy'', ''Monster Land'', and ''Monster Lair''), each with drastically different play mechanics from the last. The second arcade game spun-off the ''Monster World'' sub-series on home consoles, which adapted an action RPG approach.

Consists of the following releases:
* ''VideoGame/WonderBoy'' ([[UsefulNotes/ArcadeGame Arcade]], [[UsefulNotes/OtherSegaSystems SG-1000]], UsefulNotes/SegaMasterSystem, UsefulNotes/GameGear)
** ''Super Wonder Boy'' on the Sega Mark III
** ''Revenge of Drancon'' on the western Game Gear
* ''[[VideoGame/WonderBoyInMonsterLand Wonder Boy: Monster Land]]'' (Arcade, Master System)
** ''Wonder Boy in Monster Land'' on the Master System, Amiga, and Atari ST
** ''Super Wonder Boy: Monster World'' on the Sega Mark III
** ''Bikkuriman World'' on the PC Engine
* ''[[VideoGame/WonderBoyIIIMonsterLair Wonder Boy III: Monster Lair]]'' (Arcade, [[UsefulNotes/SegaGenesis Mega Drive]])
** ''Monster Lair'' on [[UsefulNotes/TurboGrafx16 TurboGrafx-CD]]
* ''[[VideoGame/WonderBoyIIITheDragonsTrap Wonder Boy III: The Dragon's Trap]]'' (Master System, Game Gear)
** ''Monster World II: Dragon no Wana'' on the Japanese Game Gear
** ''Wonder Boy: The Dragon's Trap'' on the western Game Gear
** ''Dragon's Curse'' on UsefulNotes/TurboGrafx16
** '''Wonderboy/Wondergirl: The Dragon's Trap'' (Nintendo Switch, Xbox One, Playstation 4, PC)
* ''[[VideoGame/WonderBoyInMonsterWorld Wonder Boy in Monster World]]'' (Mega Drive, Master System)
** ''Wonder Boy V: Monster World III'' in Japan
** ''Dynastic Hero'' on [=TurboGrafx-CD=]
* ''VideoGame/MonsterWorldIV'' (Mega Drive, Japan only until May 2012)
* ''VideoGame/MonsterBoyAndTheCursedKingdom'' (UsefulNotes/PlayStation4, PC in 2017)

[[Music/TenaciousD Young Nastyman does not feature in this series.]]
!Wonder Boy general series tropes:
* AliensAreBastards: There isn't a single non-malicious alien in the series.
* AlienInvasion: [[spoiler: The sneaky infiltration variety occurs in ''Wonder Boy in Monster World'' with the reveal that the dragon leading the evil monster invasion was actually a robot crafted by aliens in flying saucers. They try it again in ''Wonderboy in Monster World'' by brainwashing the Darkworld prince and making him the head of a new monster army. Finally, the last surviving alien tries to take over using a HatePlague spread by cute fuzzy pets in ''Monster World IV'']]
* ClothesMakeTheLegend: Quite literally with the Legendary equipment, canonically worn by each successive Wonderboy ([[AndZoidberg and Asha]]) since Monster Land.
* CompilationRerelease: The ''Monster World: Complete Collection'' (UsefulNotes/PlayStation2, Japan only) not only has all six main games, it also includes all of the cross-platforms ports (at least the ones that came out on Sega consoles) and some of the different regional releases.
* GenreShift: The three arcade games in the series are different from each other. The first ''Wonder Boy'' is a straightforward platformer, ''Monster Land'' is an action RPG, and ''Monster Lair'' is an AutoScrolling platformer with ShootEmUp segments. All of the console sequels though, stuck to the action RPG format of ''Monster Land''.
* HijackedByGanon: [[spoiler: Each new threat of evil monsters turns out to be yet another world conquest attempt by the technologically-advanced space aliens from the previous game.]]
* LegacyCharacter: Half the time, the [[CharacterTitle titular Wonder Boy]] is not actually the player character depending on the game, since only Bocke Lee Temjin (AKA Book the Hero, the protagonist of ''Monster Land'' and ''The Dragon's Trap'') is said to be the original game's "Wonder Boy" in both ''The Dragon's Trap'' and the localized version of the ''Monster Land'' manual; Leo from ''Monster Lair'', Shion from ''Monster World'' and Jin from ''Monster Boy and The Cursed Kingdom'' are each different characters, and Purapril and Asha are girls, thus obviously unfit for the "Wonder Boy" title.
** Likewise, Shiela Purapril from ''Monster World'' and Purapril XIII (or "[[SpellMyNameWithAnS Praprill XIII]]") from ''Monster World IV'' are both separate from the ''Monster Lair'' heroine (seemingly Purapril ''I'').
* MedievalEuropeanFantasy: ''Wonder Boy in Monster Land'' to ''Wonder Boy in Monster World'' all have this setting, while ''Monster World IV'' moves to an Arabian Fantasy setting.
* OddlyNamedSequel: The lineage of the series is hard to keep track of thanks in part to the various name changes each installment has gone through between localizations, cross-platform ports and licensed remakes made by other companies.
* TitleConfusion: There are two games titled "Wonder Boy III" and both are justified since they're the third Wonder Boy games for their corresponding platforms. ''Monster Lair'' was the third arcade game and ''The Dragon's Trap'' was the third Master System game. Officially speaking, the latter is known as ''Monster World II'' in Japan, where it is recognized as the fourth Wonder Boy game, since the following game (''Wonder Boy in Monster World'') was called ''Wonder Boy V: Monster World III'' over there.
* ToBeContinued: ''Monster Land'' and ''Monster Lair'' both end with ominous foreshadowing, and ''Monster World'' explicitly ends on a "To be continued."
* WingedSoulFliesOffAtDeath: Happens to the many protagonists throughout the series when they die.