zhHK

zh-HK is an IETF language tag used to identify Chinese text localized for Hong Kong. It denotes content intended for readers in Hong Kong and typically presumes the use of Traditional Chinese characters along with vocabulary and expressions common in Hong Kong Cantonese-speaking contexts. In software localization, websites, and published materials, zh-HK signals that the content should adhere to the linguistic norms and terminology familiar to users in Hong Kong.

Content tagged zh-HK often differs from zh-CN (Mainland China) and zh-TW (Taiwan) in vocabulary and conventions, even though all typically use Traditional characters, with local terms such as 的士 for taxi, 巴士 for bus, and 地鐵 for the subway. Differences also arise in date and measurement conventions, official terminology, and bureaucratic style. For precision, some projects use the more explicit zh-Hant-HK tag to indicate Traditional Chinese script for Hong Kong.

Linguistically, zh-HK is not a separate language but a locale identifier within the Chinese language family. It is part of the IANA language registry and is commonly paired with the Hong Kong geographic region. The tag supports content localization alongside zh-CN and zh-TW to accommodate regional variants of written Chinese.