起司蛋糕，又称为起士蛋糕、奶酪蛋糕，是西方甜点的一种。有着柔软的上层，混合了特殊的芝士，如里考塔或奶油芝士，再加上糖和其他的配料，如鸡蛋、奶油和水果等。起士蛋糕通常都以饼干做为底层，亦有不使用底层的，有固定的几种口味，如原味、香草起士蛋糕，巧克力起士蛋糕等，至于表层加上的装饰，常常是草莓或蓝莓，也有不装饰或是只是在顶层简单抹上一层薄蜂蜜的种类。此类蛋糕在结构上较一般蛋糕紥实，但质地却较一般蛋糕来得绵软，口感上亦较一般蛋糕来得湿润，若以具体事物来描述，起士蛋糕是口感上类似于提拉米苏或是慕思之类的糕点，但本身又不若两者那幺绵软。

Cheesecake is a sweet dessert consisting of one or more layers. The main, and thickest layer, consists of a mixture of soft, fresh cheese (typically cream cheese or ricotta), eggs, and sugar; if there is a bottom layer it often consists of a crust or base made from crushed cookies (or digestive biscuits), graham crackers, pastry, or sponge cake. It may be baked or unbaked (usually refrigerated). Cheesecake is usually sweetened with sugar and may be flavored or topped with fruit, whipped cream, nuts, cookies, fruit sauce, and/or chocolate syrup. Cheesecake can be prepared in many flavors, such as strawberry, pumpkin, key lime, chocolate, Oreo, chestnut, or toffee.