Hunter × Hunter (pronounced "hunter hunter") is a Japanese manga series written and illustrated by Yoshihiro Togashi. It has been serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump since March 1998, although the manga has frequently gone on extended hiatuses since 2006. Its chapters have been collected in 38 tankōbon volumes as of September 2024. The manga has been licensed for English release in North America by Viz Media.

The story focuses on a young boy named Gon Freecss who discovers that his father, who left him at a young age, is actually a world-renowned Hunter, a licensed professional who specializes in fantastical pursuits such as locating rare or unidentified animal species, treasure hunting, surveying unexplored enclaves, or hunting down lawless individuals. Gon departs on a journey to become a Hunter and eventually find his father. Along the way, Gon meets various other Hunters and encounters the paranormal.

Hunter × Hunter was adapted into a 62-episode anime television series by Nippon Animation and directed by Kazuhiro Furuhashi, which ran on Fuji Television from October 1999 to March 2001. Three separate original video animations (OVAs) totaling 30 episodes were subsequently produced by Nippon Animation and released in Japan from 2002 to 2004. A second anime television series by Madhouse aired on Nippon Television from October 2011 to September 2014, totaling 148 episodes, with two animated theatrical films released in 2013. There are also numerous audio albums, video games, musicals, and other media based on Hunter × Hunter.

Hunter × Hunter has been widely acclaimed and commercially successful, becoming one of the best-selling manga series of all time with over 84 million copies in circulation worldwide by July 2022.

In the world of Hunter × Hunter, Hunters (ハンター, Hantā) are licensed, elite members of humanity who are capable of tracking down secret treasures, rare beasts, or even other individuals, and can also access locations that regulars cannot. To obtain a license, one must pass the rigorous annual Hunter Examination run by the Hunter Association, which has a success rate of less than one in a hundred-thousand. A Hunter may be awarded up to three stars: a single star for making "remarkable achievements in a particular field"; they may then be upgraded to two stars for "holding an official position" and mentoring another Hunter up to single star level; and finally upgraded to three stars for "remarkable achievements in multiple fields".

Nen (念) is the ability to control one's own life energy or aura, which is constantly emitted from them, knowingly or not. There are four basic Nen techniques: Ten (纏) maintains the aura in the body, strengthening it for defense; Zetsu (絕) shuts the aura flow off, useful for concealing one's presence and relieving fatigue; Ren (練) enables a user to produce more Nen; and Hatsu (發) is a person's specific use of Nen. Nen users are classified into six types based on their Hatsu abilities; Enhancers (強化系, Kyōkakei) strengthen and reinforce their natural physical abilities; Emitters (放出系, Hōshutsukei) project aura out of their bodies; Manipulators (操作系, Sōsakei) control objects or living things; Transmuters (変化系, Henkakei) change the type or properties of their aura; Conjurers (具現化系, Gugenkakei) create objects out of their aura; and Specialists (特質系, Tokushitsukei) have unique abilities that do not fall into the previous categories. A Nen user can enter into a Contract (誓約, Seiyaku) where, by pledging to follow certain Limitations (制約, Seiyaku), their abilities are strengthened in relation to how strict they are. An example of this is Kurapika who, in order to have an unbreakable chain that will fully restrain members of the Phantom Troupe, offered his life, should he use it on anyone other than its members.

The story follows Gon Freecss, a young boy raised believing both his parents were dead. After discovering from Kite, an apprentice of his father Ging Freecss, that Ging is alive and a renowned Hunter, Gon leaves his home on Whale Island (くじら島, Kujira Tō) to undertake the Hunter Examination (ハンター試験, Hantā Shiken) and follow in his father's footsteps. During the exam, Gon befriends three other candidates: Kurapika, the last survivor of the Kurta clan seeking vengeance against the Phantom Troupe for slaughtering his people; Leorio, an aspiring physician pursuing the financial benefits of being a Hunter; and Killua Zoldyck, a former assassin from the infamous Zoldyck family. Among the examinees is Hisoka, a deadly transmuter who takes a keen interest in Gon. After numerous trials, Gon and his friends pass the exam, except for Killua, who fails after killing another applicant under his brother Illumi's influence and retreats to his family's estate.

After reuniting with Killua, Gon and his companions separate temporarily. Gon and Killua travel to Heavens Arena (天空闘技場, Tenkū Tōgijō), a towering martial arts arena where they train under Wing, a master who teaches them Nen, a Qi-like energy that unlocks parapsychological abilities and is the Hunter Exam's true final requirement. Later, the group reconvenes in Yorknew City (ヨークシンシティ, Yōkushin Shiti), where they clash with the Phantom Troupe. Kurapika kills two members and seals their leader Chrollo Lucilfer's powers, but is forced to abandon further pursuit to rescue Gon and Killua.