Tartar sauce (French: sauce tartare; also spelled Tartare sauce in the UK, New Zealand, Australia, South Africa, and other parts of the Commonwealth) is a condiment made of mayonnaise, chopped pickles, capers and herbs such as tarragon and dill.

Tartar sauce can also be enhanced with the addition of gherkins, other varieties of pickles, and lemon juice as well as herbs such as parsley. It is most often used as a condiment with seafood dishes such as fish and chips, clam strips, fried oysters, fish sandwiches, and fish fingers, among many other dishes.