Matsuo Keijyu (松尾 桂樹, Matsuo Keiju, born January 10) is a voice actor (seiyu) from Yamagata Prefecture. He is affiliated with AUspicious (former AstralBlaze). He is 1.72 m tall and has blood type A. His hobbies include public baths, running, video games, tennis, and snowboarding; his special abilities include imitating alarm sounds, and drinking soda in one gulp.