Hawala (also known as hundi) is an informal value transfer system used primarily in the Middle East, Africa and Asia.

Its origins are not entirely clear, but it is believed to have been used first in the financing of long-distance trade in the early medieval period on trading routes such as the Silk Road, the Eastern Mediterranean and the Indian Ocean. Hawala is mentioned in texts of Islamic jurisprudence as early as the 11th Century. In South Asia, it appears to have developed into a fully-fledged money market instrument, which was only gradually replaced by the instruments of the formal banking system in the first half of the 20th century. Today hawala is probably used mostly for migrant workers' remittances to their countries of origin.

In the most basic variant of the hawala system, money is transferred via a network of hawala brokers, or hawaladars. A customer approaches a hawala broker in one city and gives a sum of money to be transferred to a recipient in another, usually foreign, city. The hawala broker calls another hawala broker in the recipient's city, gives disposition instructions of the funds (usually minus a small commission), and promises to settle the debt at a later date.

The unique feature of the system is that no promissory instruments are exchanged between the hawala brokers; the transaction takes place entirely on the honor system. As the system does not depend on the legal enforceability of claims, it can operate even in a defunct legal and juridical environment. No records are produced of individual transactions; only a running tally of the amount owed one broker by the other is kept. Settlements of debts between hawala brokers can take a variety of forms, and need not take the form of direct cash transactions.

In addition to commissions, hawala brokers often earn their profits through bypassing official exchange rates. Generally the funds enter the system in the source country's currency and leave the system in the recipient country's currency. As settlements often take place without any foreign exchange transactions, they can be made at (black) market rather than official rates.

Hawala is attractive to customers because it provides fast, convenient and safe transfer of funds, usually with a lower commission than that charged by banks. Its advantages are most pronounced when the receiving country applies distortive exchange rate regulations (as has been the case for many typical receiving countries such as Pakistan or Egypt) or when the banking system in the receiving country is underdeveloped (e.g. due to weak legal environment in places such as Afghanistan, Yemen, Somalia).

Furthermore, the transfers are informal and not effectively regulated by governments, which is a major advantage to customers with tax, currency control, immigration, or other legal concerns. For the same reasons, governments disfavor the system, and accusations have been made in recent years that terrorist funding often changes hands through hawala networks.

There exist networks similar to hawala that are given more credibility by the Western world. These include Western Union.