Japanese Army and Navy Ranks

This reference list provides the military ranks used by the Imperial Japanese Army and Navy during the First World War. It includes officer and enlisted grades, with romanized titles and English renderings. Where no exact modern equivalent exists, the literal historical form has been retained.

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Japanese Military Ranks (1914–1918)

Japan entered the First World War as Britain’s ally under the Anglo-Japanese Alliance and maintained a rank system modeled closely on continental European precedents. The Imperial Japanese Army adopted a Prussian-influenced hierarchy, with Taishō(general), Chūjō (lieutenant general), and Shōshō (major general) as the principal general officer grades, supported by field officers down to Shō-i (second lieutenant). Gensui was a special marshal dignity conferred only by the Emperor. The enlisted structure extended from Sōchō (sergeant major) through Heichō (lance corporal) and three classes of Heitai (privates). The Imperial Navy paralleled European practice, with Kaigun Taishō (admiral), Kaigun Chūjō (vice admiral), and Kaigun Shōshō (rear admiral) heading the flag officer corps, supported by a full continuum of captaincies down to Kaigun Shō-i (ensign). Enlisted sailors advanced through multiple classes of Suihei (seamen), while petty officers were divided into three grades of Heisō. Aviation units existed within both the Army and Navy but had no separate rank system. This dual hierarchy underscored Japan’s adoption of European military models while retaining uniquely Japanese terminology and imperial dignities.

Army — Officer Ranks

Army — NCO & Enlisted Ranks

Navy — Officer Ranks

Navy — NCO & Enlisted Ranks

Notes

• “Gensui” was an honorific dignity conferred by the Emperor, not a routine grade.
• The Imperial Japanese Army had no brigadier general rank; brigades were commanded by major generals (Shōshō).
• “Heichō” was grouped administratively with privates though functioning as a lance corporal.
• The Navy did not maintain a formal commodore rank; senior captains could fly a broad pennant when acting as flag officer.
• Air arms (Army and Navy) existed within their respective services; no independent Air Force until postwar.
• Abbreviations: period Japanese usage was in kanji, not romanization; column left blank where not attested.