Wakabayama Sadao (若葉山 貞雄, November 9, 1922 – January 17, 2001) was a sumo wrestler from Yame, Fukuoka, Japan. His highest rank was komusubi. He earned four gold stars for defeating yokozuna. After his retirement from active competition in 1961 he became an elder of the Japan Sumo Association under the name Shikoroyama.