外汇市场（Foreign exchange market，简称Forex、FX或currency market）是一个分散于全球各地用于交易货币的金融市场。除星期六、星期天和交易中心所在国家的重大节日外，世界各地的金融中心按所处位置轮流运转，使外汇市场能24小时不间断的买卖各种货币。按交易契约种类，有即期、掉期、也有远期合约等市场存在。外汇市场决定不同货币之间的汇率。

外汇市场的主要目的是允许企业通过转换不同的币种来促进国际间的贸易和投资。举例来说：它允许美国企业进口英国商品并以英镑支付其费用，尽管该企业的收支是以美元计算的。它也支持货币投机行为和套利交易。

The foreign exchange market (forex, FX, or currency market) is a global decentralized market for the trading of currencies. This includes all aspects of buying, selling and exchanging currencies at current or determined prices. In terms of volume of trading, it is by far the largest market in the world. The main participants in this market are the larger international banks. Financial centres around the world function as anchors of trading between a wide range of multiple types of buyers and sellers around the clock, with the exception of weekends. The foreign exchange market does not determine the relative values of different currencies, but sets the current market price of the value of one currency as demanded against another.