One Outs (stylized in all caps) is a Japanese baseball-themed manga series written and illustrated by Shinobu Kaitani.

It was serialized in Shueisha's seinen manga magazine Business Jump from 1998 to 2006, followed by a short-term sequel, One Outs: Miwaku no All-Star-hen, from 2008 to 2009.

A 25-episode anime television series adaptation produced by Madhouse, and directed by Yuzo Sato, aired on Nippon TV from October 2008 to April 2009.

Hiromichi Kojima, the Lycaons' star batter, forms a training camp in Okinawa to try for his last attempt at a championship after 21 years.

Though there is heavy dissent in the team due to his dubious nature, Tokuchi starts to implement a wide variety of changes, most notably the L-Ticket.

One Outs, written and illustrated by Shinobu Kaitani, was serialized in Shueisha's seinen manga magazine Business Jump from 1998 to 2006.

'One Outs: The Enthralling All-Star Edition'), was serialized from 2008 to 2009, with its chapters collected in a single tankōbon volume, released on February 19, 2009.