Nagai Naohiro (永井 直敬, 1664 – July 18, 1711) was a Japanese daimyō of the Edo period, who ruled the Akō Domain following its confiscation from Asano Naganori. Naohiro was the eldest son of Nagai Naotsune, and assumed family headship after his father's death. Upon the confiscation of the 's territory in Shimotsuke Province, Naohiro was transferred there from his previous holdings in Kawachi, and thus became the lord of the Karasuyama Domain. Naohiro was appointed to the offices of jisha-bugyō and sōshaban in 1694, and in the fall of 1701, after the execution of Asano Naganori, he received a 3000 koku increase in stipend, becoming the new lord of Akō, with a territory of 33,000 koku. However, because of the time-consuming nature of his work as jisha-bugyō, the domain's affairs were run by his