Yamauchi Katsutoyo

Yamauchi Kazutoyo
Bronze statue of Yamauchi in Kochi
Lord of Kakegawa
In office 1590–1600
Preceded by	none
Succeeded by	Matsudaira Sadakatsu
Lord of Tosa
In office 1601–1605
Preceded by	Chōsokabe Morichika
Succeeded by	Yamauchi Tadayoshi
Personal details
Born	1546? Owari Province, Japan
Died	November 1, 1605 Kōchi, Japan
Nationality	Japanese
Spouse(s)	Yamauchi Chiyo

Yamauchi Kazutoyo (山内 一豊 （やまうち かつとよ）^?), also spelled Yamanouchi (1545/1546? – November 1, 1605), was born the son of Yamanouchi Toyonao in Owari Province at the end of the Sengoku period of Japan. Kazutoyo held the title of Tosa no kami.

Kazutoyo built Kōchi Castle. His life spanned the closing years of the Sengoku period, the Azuchi–Momoyama period, and the beginning of the Edo period.

Just four years after he became Lord of Tosa, Kazutoyo died without issue aged around 60, and was succeeded as Lord of Tosa by his nephew Tadayoshi.

The 45th NHK Taiga drama (2006) is a dramatization of the life of Kazutoyo, with his wife Chiyo as the central character. Kōmyō-ga-tsuji: Yamauchi Kazutoyo no Tsuma stars Nakama Yukie as Chiyo. Takaya Kamikawa plays Kazutoyo. The story tells how Chiyo, as a wise and beautiful wife, helped her husband Yamauchi Kazutoyo up from an ordinary samurai to the governor of an entire province, Tosa. The story is by Shiba Ryōtarō.