A contingent fee (also known as a contingency fee in the United States or a conditional fee in England and Wales) is any fee for services provided where the fee is payable only if there is a favourable result. Although such a fee may be used in many fields, it is particularly well associated with legal practice.

In the law, a contingent fee is defined as a fee charged for a lawyer's services that is payable only if a lawsuit is successful or results in a favorable settlement, usually in the form of a percentage of the amount recovered on behalf of the client. Contingent fees may make it easier for people of limited means to pursue their civil rights since otherwise, to sue someone for a tort, one must first be wealthy enough to pursue such litigation in the first place. Due to the risk of loss, attorneys will not take cases on a contingency basis unless they believe that the case has merit, although accepting cases on a contingency is not without risk.