'3rd Base 4th') is a Japanese sports manga series written and illustrated by Gosho Aoyama.

The story depicts the final tournament of high school baseball, at the Hanshin Koushien Stadium in Nishinomiya.

The story's main characters are the high school baseball players Shigeo Nagashima and Kazuhisa Inao, whose names are taken from real-life Japanese baseball players Shigeo Nagashima and Kazuhisa Inao.

[2] Gosho Aoyama referenced the story in his Case Closed manga in volumes 43 and 44 (chapters 445–449).

[4][5] Shogakukan collected its chapters in a single tankōbon volume, published under the Shōnen Sunday Comics imprint on March 18, 1993.