Ichiki Tatsuo (市来龍夫) (1906 – 9 January 1949) was a Japanese journalist who defected to Indonesia and participated in the Indonesian National Revolution.

He then found employment as a bus conductor, but before long left the job and stayed with Iti, a local woman whose family lived in the nearby town of Sumedang.

During this time, he worked on a Japanese-Indonesian dictionary, translated Japanese articles for local newspapers, and kept himself updated on the political situation back in Japan.

[4] As Tatsuo was in contact with Indonesian nationalist leaders, he became a target of surveillance from Dutch authorities following the increase of tensions between the countries in the buildup to the Pacific War.

In August 1938, Tatsuo went to Tokyo to discuss a publication project he planned, but was not allowed to return to Java due to his involvement in an affair where the Japanese attempted to purchase a newspaper to counter anti-Japanese coverage.

In addition, he also translated in official events and proposed the creation of an Indonesian language development committee, and later became part of it alongside nationalist leaders such as Sukarno and Hatta.

[9] He also became an adviser to the education department for the volunteer army PETA, during which Agus Salim gave him the nickname Abdul Rachman for Tatsuo's pro-Indonesian leanings.

[10] Following the surrender of Japan and the subsequent Proclamation of Indonesian Independence, Tatsuo visited a former training chief at PETA and asked to join the movement, although he was initially rejected.

[10][12][13] Tatsuo was killed on the front lines, in the village of Arjosari to the southeast of Malang, during the surprise offensive Operation Kraai conducted by the Dutch on 9 January 1949.

[12][13] He was shot in the forehead: according to testimonies from his comrades, Tatsuo had charged towards the Dutch soldiers in what appeared to be an attempt to motivate the guerilla fighters.