Court costs (also called law costs in English procedure) are the costs of handling a case, which, depending on legal rules, may or may not include the costs of the various parties in a lawsuit in addition to the costs of the court itself. In the United States, "court costs" (such as filing fees, copying and postage) are differentiated from attorney's fees, which are the hourly rates paid to attorneys for their work in a case. Court costs can reach very high amounts, often far beyond the actual monetary worth of a case. Cases are known in which one party won the case, but lost more than the monetary worth in court costs. Court costs may be awarded to one or both parties in a lawsuit, or they may be waived.

In the United Kingdom, Australia and Canada, the losing side is usually ordered to pay the winning side's costs. This acts as a significant disincentive to bringing forward court cases. Usually, the winning party is not able to recover from the losing party the full amount of their own solicitor's (attorney's) costs, and has to pay the shortfall out of pocket. The loser pays principle does not generally apply under the United States legal system.