Futaro Yamada (?? ???, Yamada Futaro, January 4, 1922 – July 28, 2001) was the pen name of Seiya Yamada (?? ??, Yamada Seiya), a Japanese author.
He was born in Yabu, Hyogo.
In 1947, he wrote a mystery short story Daruma-toge no Jiken (??????, lit.
"The Incident on Dharma Pass") and was awarded a prize by the magazine Houseki (??).
He was discovered by Edogawa Rampo and became a novelist.
He wrote many ninja (??? Ninpocho series) and mystery stories.
Many of his works have been adapted for film, TV, manga, and anime.