Saki (咲-Saki-) is a Japanese manga series written and illustrated by Ritz Kobayashi. The story revolves around a first-year high school girl named Saki Miyanaga who is brought into the competitive world of mahjong by another first-year, Nodoka Haramura. The manga has been serialized in Square Enix's Young Gangan since February 3, 2006 and is licensed in English by Yen Press. A 25-episode anime adaptation by Gonzo aired between April and September 2009 on TV Tokyo.

Japanese mahjong , also known as riichi mahjong, is a variation of mahjong. While the basic rules to the game are retained, the variation features a unique set of rules such as riichi and the use of dora. The variant is one of a few styles where discarded tiles are ordered rather than placed in a disorganized pile. This is primarily due to the furiten rule, which takes player discards into account. The variant has grown in popularity due to anime, manga, and online platforms.