在金融学中，差价合约（英文：Contract for Difference、CFD）是买方和卖方之间的一项合约，根据合约由卖方付给买方资产现行价值和平仓价值之间的差价（反之，如果差价为负，由买方付给卖方）。事实上，差价合约是一种金融衍生工具，它允许交易者利用标的资产的价格上涨或价格下跌获利。

比方说当标的资产为股本时，合约即成为股本衍生工具，允许交易者在不拥有股本的情况下参与股价投机。

差价合约可在英国、香港、荷兰、波兰、葡萄牙、德国、瑞士、意大利、新加坡、南非、澳大利亚、加拿大、新西兰、瑞士、挪威、法国、爱尔兰、日本和西班牙等国家和地区市场上交易。因为受到美国证券交易委员会关于场外交易金融商品的限制，CFD不能在美国市场进行交易。

In finance, a contract for difference (CFD) is a contract between two parties, typically described as "buyer" and "seller", stipulating that the seller will pay to the buyer the difference between the current value of an asset and its value at contract time (if the difference is negative, then the buyer pays instead to the seller). In effect CFDs are financial derivatives that allow traders to take advantage of prices moving up (long positions) or prices moving down (short positions) on underlying financial instruments and are often used to speculate on those markets.