Dewanishiki Tadao (July 15, 1925 – January 1, 2005) was a sumo wrestler from Sumida, Tokyo, Japan.

He won ten kinboshi or gold stars for defeating yokozuna during his long top division career, which only four wrestlers have bettered.

He achieved his highest career rank of sekiwake in May 1956, but had a 3-9-3 record which dropped him back to maegashira level.

He earned his tenth and final kinboshi in March 1963, defeating yokozuna Taihō Kōki on Day 4 of the tournament.

Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi