Fish pie is a British savoury dish made with fish in a creamy white sauce and usually covered with mashed potatoes before baking.
The filling commonly includes smoked haddock, cod, salmon, or other fish, sometimes with prawns, peas, or hard-boiled eggs. Unlike pastry-topped pies, the classic British form uses mashed potato as its browned topping, making it closer in structure to a fish-based gratin or shepherd's-pie-style bake.
Recipes vary widely by region and household. The sauce may be based on milk thickened with flour and butter, while parsley is a frequent seasoning. Fish pie is distinct from cottage pie, whose filling is minced beef, and from fisherman's pie, a term often used interchangeably but sometimes applied to versions containing several kinds of seafood.