Wakasegawa Taiji (??????????, real name Tadao Hattori, 20 February 1920 – 3 September 1993) was a sumo wrestler from Amagasaki, Hyogo Prefecture, Japan.
He made his professional debut in 1935, reaching the top makuuchi division in 1942.
His highest rank was komusubi.
He was twice runner-up in a tournament and earned seven gold stars for defeating yokozuna and four special prizes.
He retired in 1959 at the age of 38 and became an elder of the Japan Sumo Association, working as a coach at Isegahama stable until his mandatory retirement in 1985.