Yokoi Yayū (横井 也有, October 24, 1702 – July 15, 1783) was a Japanese samurai best known for his haibun, a scholar of Kokugaku, and haikai poet.

Yayū moved to Maezu (前津) (now in Naka-ku, Nagoya), and lived in the Chiutei (知雨亭) hermitage.

Yayū also excelled in Japanese martial arts, studied Confucianism and learned haikai from Mutō Hajaku (武藤巴雀) and Ōta Hajō (太田巴静).

Hajaku and Hajō were pupils of Kagami Shikō (各務支考), a leading disciple of Matsuo Bashō.

Mori Senzō (森銑三), a student of old Japanese literature, compared his hokku to senryū, and said they were not as interesting as his haibun.