Taipei Economic and Cultural Representative Office in Japan represents the interests of Taiwan in Japan, functioning as a de facto embassy in the absence of diplomatic relations. It is operated by the Taiwan–Japan Relations Association, a parastatal agency of the government.

A de facto embassy is an office or organisation that serves de facto as an embassy in the absence of normal or official diplomatic relations among countries, usually to represent nations which lack full diplomatic recognition, regions or dependencies of countries, or territories over which sovereignty is disputed. In some cases, diplomatic immunity and extraterritoriality may be granted.