Katakura Shigenaga (?? ??, 1585 – May 16, 1659) was a Japanese samurai of the Azuchi-Momoyama period through early Edo period.
The son of Katakura Kagetsuna, Shigenaga was the second man to bear the common name Kojuro.
His name was originally Shigetsuna; however, to avoid conflict with the fourth shogun Ietsuna's name, he changed it to Shigenaga.
In 1614, he took part in the Osaka Campaign, fighting Goto Matabei at Domyoji Temple.Following the Osaka Campaign, Shigenaga married a daughter of Sanada Yukimura and his wife, Chikurin-in (Otani Yoshitsugu's daughter and adopted daughter of Toyotomi Hideyoshi), and adopted their second son, Sanada Daihachi, later known as "Katakura Heinosuke Morinobu".
He also assisted many of the masterless former Sanada retainers.
He was succeeded by his maternal grandson also adopted son, Kagenaga.