Key lime pie is an American dessert pie. It is made of lime juice, egg yolks, and sweetened condensed milk. It is best served with meringue topping and is typically cooked in a graham cracker crust.

The dish is named after the small Key limes which which have yellow juice complementing the filling which is typically yellow because of the egg yolks used.

The filling is made by simply mixing the ingredients without cooking the proteins of the egg yolks and condensed milk and the acidic lime juice curdle, thickening the mixture without baking.