Romanization Day

What Is Romanization Day?

Every May 20th is also "Romanization Day" (ローマ字の日, Rōmaji no Hi) in Japan. On May 20, 1937, the Japanese government under Prime Minister Konoe Fumimaro issued a cabinet order standardizing "Nihon-shiki" romanization (日本式ローマ字, Nihon-shiki Rōmaji) as Japan's official system for writing the Japanese language in Roman letters. The Japan Romanization Society (財団法人日本ローマ字会), which had been established in 1922, designated May 20th as Romanization Day to mark this official recognition and to promote the systematic use of Roman letters for Japanese.

Romanizing Japanese

The romanization of Japanese — writing the sounds of the Japanese language using the Latin alphabet — has been an ongoing project since European missionaries created the first romanization systems in the 16th century. Multiple competing systems have been developed: Hepburn romanization (ヘボン式, most widely used internationally), Nihon-shiki (日本式, strictly systematic), and Kunrei-shiki (訓令式, a government-approved compromise adopted in 1937 and updated in 1954). Each system makes different choices about how to represent Japanese sounds in Roman letters.

Romanization in Japan's Global Context

Roman letters (ローマ字, rōmaji) play an important practical role in modern Japan — they appear on railway station signs (alongside Japanese), on passport and official documents, in product names marketed internationally, and in the input systems used to type Japanese on computers and smartphones (where users typically type romanized sounds that are converted to Japanese characters). The question of which romanization system to use — and when — remains a practical and occasionally political issue in Japan's relationship with international communication standards.

The Romanization Debate

In the early Meiji era, some reformers proposed abandoning Japanese scripts entirely in favor of Roman letters — arguing that Japan's complex writing system was an obstacle to modernization and international communication. This radical proposal was rejected, but the debate about romanization's role in Japanese life continues in milder forms: how to romanize station names, how to format Japanese names in international contexts, and how to balance traditional Japanese orthographic conventions with international readability.

Fun Facts

• IME input: The most common way to type Japanese on computers and smartphones today is through a Roman letter input system (ローマ字入力, rōmaji nyūryoku) — users type the romanized pronunciation of what they want to say, and software converts it to hiragana, then offers kanji conversion options. This makes romanization an everyday necessity for millions of Japanese users who may not consciously think of it as "romanization."
• Hepburn system: James Curtis Hepburn (1815–1911), the American missionary and physician who compiled Japan's first Japanese-English dictionary (1867), developed the romanization system that bears his name and remains the most internationally recognized standard — appearing on street signs and in English-language publications about Japan worldwide.