Viscount Motono Ichirō (本野 一郎, March 23, 1862 – September 17, 1918) was a statesman and diplomat, active in Meiji period Japan.

Motono studied law in France, and in 1896 translated the civil code of the Japanese Empire into French [1].

He served as Minister Plenipotentiary to the Kingdom of Belgium in 1898–1901, and in that capacity represented the Empire of Japan at the 1899 Hague Peace Conference.

In 1905 he served as a judge at the Permanent Court of Arbitration, and formed a dissential opinion in the case of the Japanese Tax House [2].

On June 14, 1907, he was granted the title of baron (danshaku) under the kazoku peerage system for his services, and was also awarded the Order of the Rising Sun, 1st class.