Baron Tachibana Koichirō (立花小一郎, 20 March 1861 – 15 February 1929) was a general in the early Imperial Japanese Army, and later a politician in the Diet of the Empire of Japan.

[1] On his return to Japan, Tachibana was assigned to the Japanese China Garrison Army, becoming a military advisor to Yuan Shikai.

With the start of the Russo-Japanese War, Tachibana was deputy chief-of-staff of the Japanese Fourth Army under General Nozu Michitsura.

In March 1905 he was promoted to colonel and was ordered back to Japan shortly after the Battle of Mukden to serve on the staff of the Imperial General Headquarters.

At a press conference in Vladivostok, Tachibana stated that he hoped that the Far Eastern Republic would soon establish a stable, democratic and independent government in the region, as Japan had no interest in remaining to interfere in Russian politics.