Nishinoumi Kajirō II (西ノ海 嘉治郎, February 6, 1880 – January 27, 1931) was a sumo wrestler. He was the sport's 25th Yokozuna.
Nishinoumi was promoted to the top makuuchi division in May 1906. He was awarded a yokozuna licence by the house of Yoshida Tsukasa in February 1916 after winning a championship at January 1916 tournament. He was 36 years old at the time of his promotion, making him the oldest wrestler to be promoted to yokozuna in the 20th century. In the top makuuchi division, he won 106 bouts and lost 38 bouts, recording a winning percentage of 73.6.
He favoured the style of dohyo-iri (yokozuna ring entering ceremony) that has come to be known as unryu.
After his retirement, he was an elder known as Izutsu and produced many top division wrestlers, such as yokozuna Nishinoumi Kajirō III. He augmented an effect of Izutsu on Japan Sumo Association but he was blamed for using his position unfairly by his opponents. He committed suicide by hanging on January 27, 1931.
His adopted daughter's adopted daughter's sons are Sakahoko Akihiro and Terao Tsunefumi.
There have been three sumo wrestlers named Nishinoumi Kajirō: