Naitō Ienaga was a Japanese samurai of the Sengoku Period through Azuchi-Momoyama Period, who served the Tokugawa clan. He was the son of Naitō Kiyonaga. Ienaga served Tokugawa Ieyasu from a young age, and was famed for his skill with the bow. He assisted in the suppression of the Ikkō-ikki of Mikawa Province, and this earned him Ieyasu's trust.