Saki (咲-Saki-) is an ongoing 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 has been collected into ten tankōbon volumes in Japan as of December 2012. A 25-episode anime adaptation by Gonzo aired between April and September 2009 on TV Tokyo.

A side-story manga illustrated by Aguri Igarashi, Saki Achiga-hen episode of Side-A (咲 Saki 阿知賀編 episode of Side-A), was serialized between the September 2011 and April 2013 issues of Monthly Shōnen Gangan, with an anime adaptation by Studio Gokumi airing between April and July 2012, with four additional episodes airing between December 2012 and May 2013. A third anime series, Saki: The Nationals (咲-Saki-全国編, Saki: Zenkoku-hen?), also by Studio Gokumi, began airing from January 5, 2014. A spin-off series to Achiga-hen, Side story of -Saki-: Shinohayu the dawn of age, began serialization in Big Gangan from September 2013. A gag manga series by Saya Kiyoshi, Saki Biyori, began serialization in Young Gangan from June 17, 2011.