Nayoroiwa Shizuo (名寄岩静男, September 27, 1914 – January 26, 1971) was a Japanese sumo wrestler from Nayoro, Hokkaidō, Japan.

In January 1938, he defeated yokozuna Musashiyama, gaining his first kinboshi or gold star.

In the September 1952 tournament, he defeated yokozuna Chiyonoyama, gaining a kinboshi and winning his second Fighting Spirit Award.

In January 1953 he returned to sekiwake, and he remains the oldest man in the post-war era to be promoted to a san'yaku rank.

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