The Antwerp Diamond Bank (ADB; French: Banque Diamantaire Anversoise, Dutch: Antwerpse Diamantbank), created in 1934 and known during its first few years as Comptoir Diamantaire Anversois, was a small bank that specialized exclusively in serving the diamond and the diamond-jewelry industry.

In addition to its headquarters in Antwerp, it had offices covering major traditional as well as emerging diamond centers such as Dubai, Geneva, Hong Kong, Mumbai, and New York.

In 1999, ADB became a wholly owned subsidiary of KBC Bank, and in 2014 it was wound down after a sale process to the Chinese Yinren Group failed.

[2] The diamond industry in Antwerp was heavily Jewish in its membership and so suffered inordinately during the German occupation of Belgium during World War II.

[2] That same year, Forminière sold its shares in ADB to Société Minière de Bécéka (Sibeka).

To do so, KBC bought out Henfin Holding, which had represented De Beers on the board of ADB as one of its founding shareholders.

[2] That same year, ADB opened a branch in Mumbai, the center for India's diamond industry, with a staff of about 20.

This was a regional headquarters that supports and develop activities in Mumbai, Hong Kong and possible future initiatives in China.