Yamamoto Jōtarō (山本条太郎, October 11, 1867 – March 25, 1936) was a politician and businessman in late Meiji and early Taishō period Empire of Japan.

[1] He was forced to resign from Mitsui in 1914, after being implicated in the Siemens Bribery Scandal, a spectacular political scandal involving collusion between several high-ranking members of the Imperial Japanese Navy, Mitsui, and the German industrial conglomerate Siemens AG.

One of his first tasks was to negotiate leases to permit the building of two additional spur lines directly with Fengtian clique warlord Zhang Zuolin, circumventing the Japanese Ministry of Foreign Affairs.

[3] However, the Huanggutun Incident, the assassination of Zhang Zuolin by agents of the Kwantung Army also occurred during his tenure, and he was forced into retirement.

His summer villa was located in Kamakura and is designated a Registered tangible cultural property (building).