Nagai Naotsune (永井 尚庸, 1631 – April 28, 1677) was a Japanese daimyō of the early Edo period.
He served in a variety of positions in the Tokugawa shogunate, including wakadoshiyori and Kyoto Shoshidai.
Naotsune did not formally rule a domain; however, as he was given income from various lands within Kawachi Province rated at 20,000 koku, he was counted as a daimyō.
His son Nagai Naohiro also became a high-ranking shogunate official.
This biography of a daimyō is a stub.