PT Bank CIMB Niaga Tbk is Indonesia's sixth largest bank by assets, established in 1955. CIMB Niaga, which is majority-owned by CIMB Group, is the largest payment bank in terms of transaction value under the Indonesian Central Securities Depository. With 11% of market share, CIMB Niaga is the third largest mortgage provider in Indonesia.

The bank was first established in 1955 as a national private bank. In 1969 when crisis hit the private sector in Indonesia, Bank Niaga remained sound and was eligible for Bank Indonesia’s Guarantee. Then in November 1974, Bank Niaga revamped its business plans and became a full service public bank to better meet the demands of customers.

After a merger period with several other commercial banks, the function and individuality of the Bank were restored in 1975. The status was resumed to that of a state-run commercial bank. The official name was changed to "Bank Niaga 1955".

In 1976, the bank launched a Professional Loan Program, providing loans for professionals like engineers and doctors. In 1981 and 1982, Bank Niaga 1955 became the first bank in Indonesia to apply an online banking system as well as a network system for its branches. It introduced a foreign currency exchange network in various branches in 1985 along with a variety of new products.

In 1987, Bank Niaga 1955 set itself apart from the competition when it became the first bank in Indonesia to introduce ATM services.

In June 1989, Bank Niaga made an initial public offering (IPO) to be listed on the Indonesian Stock Exchange. The shares were over-subscribed by four times the issued shares at 20.9 million shares.

In 1991, Bank Niaga became the first bank to provide online banking facilities in Indonesia.

In 1998, Bank Niaga expanded its customer base and began providing services to upper-middle class customers.