Asano Nagakoto (浅野 長勲, August 28, 1842 - February 1, 1937) was a daimyō of Hiroshima Domain for a short time after the Meiji Restoration. For the rest of the Meiji period, he was a politician and diplomat, and was one of the last surviving Japanese daimyō (Hayashi Tadataka and Wakebe Mitsunori outlived him).
Adopted by Asano Nagamichi, he served as assistant to his adoptive father through the 1860s, and attended many of the meetings and events surrounding the restoration of Imperial rule, and as such was one of many who advised the shogun Tokugawa Yoshinobu to return power to the Emperor of Japan. Unlike many from domains such as Satsuma and Chōshū, however, Asano was opposed to taking military action against the shogunate.
Nagakoto became the twelfth daimyō of Hiroshima in 1869 upon Nagamichi's retirement. The domains (han) were abolished in 1871, but Asano was granted the title of Marquis (kōshaku) under the Kazoku system of peerage which was instituted at that time.
He became a member of the Genrōin (Chamber of Elders) in 1880, was appointed ambassador to Italy two years later, and served in the House of Peers for a time as well.