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Kookmin Bank (Korean: KB국민은행) or KB is the largest bank by both asset value and market capitalization in South Korea. Kookmin Bank is not only South Korea's largest commercial bank, it is also a driving force behind the much-needed modernization of the country's banking system.

Nearly all of the bank's business remains in South Korea, although Kookmin operates branch offices in the United States, Luxembourg, New Zealand, and Japan in order to cater to Korean populations in those countries. In addition to its full range of consumer banking services, the company provides corporate lending and investment services. Since the merger, Kookmin has begun extending its loans portfolio beyond its traditional small- and medium-sized business base to include a greater share of large-scale corporate clients. Through subsidiaries, Kookmin is also active in real estate brokerage, development, and investment; trust management; venture capital investments; futures transactions; and credit investigation and loan collection.

Kookmin began establishing its own international operations in 1990, chiefly to provide banking services to Koreans living overseas. The company launched subsidiary Kookmin Bank Luxembourg as a portal to the European markets in 1992. That year, Kookmin also entered Japan, setting up a branch office in Tokyo. Two years later, Kookmin added a Singapore branch. Kookmin continued its expansion into the late 1990s, adding a branch in Hong Kong in 1996, then opening an office in Auckland, New Zealand, in 1997. In 1998, the bank also entered Brazil, opening a branch in Buenos Aires. Yet Kookmin's main thrust remained its fast-growing domestic business.