Taga Castle was a jōsaku-style Japanese castle built in the late Nara period in what is now part of the city of Tagajō in Miyagi prefecture in the Tōhoku region of far northern Honshu, Japan. Bashō tells of his visit to the site in Oku no Hosomichi. The ruins of Taga-jō and its former temple have been designated a Special Historic Site (特別史跡) since 1922.

The castles in Top 100 Japanese Castles or 100 Fine Castles of Japan were chosen based on their significance in culture, history, and in their regions by the Japanese Castle Association in 2006.