Viscount Nishi Kanjirō (西寛二郎, 5 April 1846 – 27 January 1912) was a career soldier in the early Imperial Japanese Army, serving during the Russo-Japanese War.

Nishi was born as the son of a samurai of Satsuma Domain (present-day Kagoshima Prefecture), and as a youth was in the service of Shimazu Hisamitsu.

Joining the fledgling Imperial Japanese Army in July 1871, he was made a battalion commander, and was promoted to major in December 1873.

During the First Sino-Japanese War, Nishi commanded the IJA 2nd Infantry Brigade during the invasion of the Liaodong Peninsula in Manchuria.

Nishi was appointed aide-de-camp to the Prince Fushimi Sadanaru on his trip to Europe in 1907, and on his return was elevated to viscount (shishaku).