Katsu Ryuzaki (竜崎 勝, Ryūzaki Masaru, March 25, 1940 – December 18, 1984[1]) was a Japanese actor.

In 1963, he entered the Haiyuza Training School as a 15th class student, with Isao Natsuyagi, Komaki Kurihara, Yoshio Harada, Gin Maeda, Ryuzo Hayashi, Takeo Chii, Choei Takahashi, Taisaku Akino, Kenkichi Hamahata, Miyoko Akaza, Kiwako Taichi, Takehiko Ono, Kunio Murai, Akihiko Shibata, Shunsuke Mizoguchi, and others, who were later called Haiyuza hana no 15-kisei.

[3] After a regular appearance in the TV drama Kanjuro Torimonocho (TBS) under his real name, he played the lead role of Yue Fujinami in the TV drama Kanjuro Torimonocho (TBS)[3][4] and assumed the name Masaru Ryuzaki.

In the late 1970s, he developed a stomach ulcer and recovered for a while, but in November 1984, he began to complain of poor physical condition.

[1] Thereafter his condition took a sudden turn for the worse, and he died of liver cirrhosis at 1:00 a.m. on December 18, 1984, at the National Hospital Organization Tokyo Medical Center.