Popotan (Japanese: ぽぽたん) is a Japanese adult visual novel developed by Petit Ferret with character designs by Akio Watanabe under the alias Poyoyon Rock. It was originally released as a PC game for CD-ROM on December 13, 2002, and subsequently re-released on DVD-ROM and for the PlayStation 2 with certain scenes removed. The title Popotan is a nonsensical word meant to reflect the prominence of dandelions, spelled tanpopo (たんぽぽ) in Japanese; Petit Ferret also produced a fan disc shortly before the DVD-ROM re-release. Popotan has been adapted to other media, including a novel series (Popotan～ Himitsu no Jumon～ Kōhen) by Sassami Yachiruda; a manga series by Yūjiro Izumi; a twelve episode anime television series directed by Shinichiro Kimura, animated by Shaft, and licensed in North America by Geneon USA and later, Sentai Filmworks; a radio drama (Poporaji); and several art and reference books.

Gameplay in Popotan follows a semi-predetermined plot; major events remain the same, but personal storylines can diverge from the player's choices. The game focuses on protagonist Chris, a drifter who meets three girls, the youngest of whom is 11 years old, and their maid in a mansion near the ruins of Tokyo in the distant future.