Digimon Adventure (Japanese: デジモンアドベンチャー, Hepburn: Dejimon Adobenchā), also known as Digimon: Digital Monsters Season 1 in English-speaking territories, is a 1999 Japanese anime television series produced by Toei Animation in cooperation with WiZ, Bandai and Fuji Television. It is the first anime series in the Digimon media franchise, based on the Digital Monster virtual pet released in 1997.

Digimon Adventure began production 1.5 months after the film of the same name was being produced, and it began broadcast in Japan a day after the film's theatrical release on March 7, 1999, airing until its conclusion on March 26, 2000. It was then followed up with the 2000 film Digimon Adventure: Our War Game!. Both films were adapted and released in North America as Digimon: The Movie on October 6, 2000.

With the success of Digimon Adventure, a sequel television series, Digimon Adventure 02, was broadcast from 2000 to 2001. For the series' 15th anniversary, a six-part film series titled Digimon Adventure tri. was released between 2015 and 2018, and a final film titled Digimon Adventure: Last Evolution Kizuna was released in 2020. In 2020, the series was rebooted and released under the title Digimon Adventure.

On August 1, 1999, seven children from Odaiba, Tokyo, Japan, are transported into the Digital World by Digivices that appeared before them at summer camp, where they befriend several Digimon (Digital Monsters). The children's Digivices allow their partner Digimon to Digivolve into stronger forms and combat enemies. As the children explore to find a way home, they learn that they are "DigiDestined", children chosen to save the Digital World. During their adventure, the DigiDestined are hunted by Devimon, who uses black gears to corrupt various Digimon into attacking the group. After defeating Devimon, the DigiDestined are contacted by Gennai and instructed to reach the Server Continent to retrieve artifacts called Crests, allowing their Digimon partners to Digivolve into their Ultimate forms. During this time, they are targeted by Etemon.

After Etemon is defeated, the DigiDestined learn from Gennai that there is an eighth DigiDestined child, who Myotismon is entering the real world to kill. The DigiDestined follow after Myotismon to the real world. After discovering that the eighth child is Tai's younger sister, Kari, and that Myotismon’s lieutenant Gatomon is her Digimon partner, the DigiDestined are able to defeat Myotismon. However, the boundaries between the real world and Digital World are intersecting, forcing them to return to the Digital World.

The DigiDestined face the Dark Masters, a quartet of mega-level Digimon who each took control of a part of the Digital World in their absence. In the midst of their battles, they learn that they were chosen to save the real and Digital Worlds from intersecting four years ago. Tension leads to infighting within the group and causes them to temporarily separate. After reflecting, the DigiDestined reunite to defeat the last Dark Master, and confront Apocalymon who attempts to destroy both worlds. Apocalymon destroys their Crests, but the DigiDestined realize the power of their Crests was inside them all along and manage to defeat him. With the Digital World restored, Tai and his friends leave their Digimon partners behind and return to their normal lives.

In 1999, a short film based on the virtual pets called Digimon Adventure was released. However, shortly after the film's storyboard was completed in 1998, producers at Toei Animation were requested to turn it into a television series.

The DigiDestined's character designs were created by Katsuyoshi Nakatsuru. The character names are based on kanji related to luck.