Masahisa Takenaka (竹中 正久, Takenaka Masahisa) was the 4th kumicho of the Yamaguchi-gumi, Japan's largest yakuza gang.

He took the role of kumicho (supreme Godfather) in 1984, but was assassinated at a girlfriend's home in Osaka early the next year by a rival faction, the Ichiwa-kai. The killing sparked the Yama-Ichi War.