ABSTRACT Islamic banking in Indonesia has experienced significant growth, including assets, financing provided and the number of customers. Murābaḥah is the sale and purchase of goods at the original price with the agreed-upon profit. In murābaḥah the seller must tell the cost of the product he buys and determine an additional level of profit. This research is a library research about the murābaḥah contract according to muamalah fiqh and its application in modern Islamic financial institutions. Methods of collecting data in documentation and various sources related to the murābaḥah contract are then analyzed inductively and deductively. The results of the study are the murābaḥah foundation is the principle of buying and selling with a deferred payment system. Murābaḥah, as used in Sharia banking, is based on two main elements, namely the purchase price and related costs, and the agreement on mark-up (profit). Islamic banks adopt murābaḥah to provide short-term financing to customers for the purchase of goods even though the customer does not have the money to pay. The murābaḥah financing portfolio in Islamic banks reaches 70- 80%, but in practice there have never been any problems, including; collateral which is a problem of fiqh, risk dependency as a problem of the bank, bankruptcy and delay in payment are the problems of customers, and profits are too high, namely the problem of coming from the community. Therefore, Islamic banks must make improvements in the implementation to be in accordance with Sharia. Keyword : Murābaḥah, Financing Instruments, Modern Islamic Financing