Tsubasa: Reservoir Chronicle is a Japanese manga series written and illustrated by the manga artist group Clamp. It takes place in the same fictional universe as many of Clamp's other manga series, most notably xxxHolic. The plot follows how Sakura, the princess of the Kingdom of Clow, loses all her memories and how Syaoran, a young archaeologist who is her childhood friend, goes on arduous adventures to save her, with two other companions. The Dimensional Witch Yūko Ichihara instructs him to go with two people, Kurogane and Fai D. Flowright. They search for Sakura's memories, which were scattered in various worlds in the form of angelic-like feathers, as retrieving them will help save her very being. Tsubasa was conceived when four Clamp artists wanted to create a manga series that connected all their previous works. They took the designs for the main protagonists from their earlier manga called Cardcaptor Sakura.

Clamp is an all-female Japanese manga artist group, consisting of leader and writer Nanase Ohkawa, and three artists whose roles shift for each series: Mokona, Tsubaki Nekoi, and Satsuki Igarashi.