Arimatsu is a town in Aichi Prefecture, Japan. It houses the Arimatsu Station of the Meitetsu-Nagoya Line, roughly 11 kilometres southeast of downtown Nagoya. The town merged into Nagoya on 1 December 1964, and is now a part of Midori-ku, Nagoya.
The town is known for being the location of the Battle of Okehazama in 1560, where Oda Nobunaga defeated Imagawa Yoshimoto and established himself as one of the front-running warlords in the Sengoku period. The town is also well-known for being the historical centre of shibori, or traditional Japanese tie-dye, and has supported the industry since the 17th century, dating back to 1608.