The Japanese domestic market (JDM) describes the trade mechanisms solely within Japan, including imports and exports. The term Japanese domestic market, more often used as the acronym JDM rather than the full term, may also refer to a style of modifying automobiles and a subculture of automotive culture.

Technically JDM stands for Japanese Domestic Market. It has been used for many decades as a label for goods sold specifically to Japanese based residents within the country of Japan.