浓缩咖啡（Espresso）是一种通过迫使接近沸腾的高压水流通过磨成细粉的咖啡制作而成的饮料。浓缩咖啡一般比其他方法制作出来的咖啡更加浓厚，含有更高浓度的悬浮物和已溶解固体，如表层的咖啡脂（一种奶油质地的泡沫）。因为其加压的制作过程，浓缩咖啡的口味强烈，其中的化学物质浓度非常高。浓缩咖啡经常用来做别的饮料的底料，如拿铁、卡布奇诺、玛琪雅朵、摩卡、以及美式咖啡。浓缩咖啡相比别的咖啡饮料单位体积含有更多的咖啡因，但是因为其每份体积较小，而且热水与咖啡粉的接触时间很短，一般只有7至9秒左右，所以总咖啡因含量反而较低。虽然咖啡饮料的实际咖啡因含量受体积、咖啡豆来源、烤制方法和其它因素影响，一份“典型的”浓缩咖啡含有大约53毫克咖啡因，而一份滴漏咖啡含有95至200毫克咖啡因。

Espresso (/ɛˈsprɛsoʊ/, Italian: [esˈprɛsso]) is coffee brewed by forcing a small amount of nearly boiling water under pressure through finely ground coffee beans. Espresso is generally thicker than coffee brewed by other methods, has a higher concentration of suspended and dissolved solids, and has crema on top (a foam with a creamy consistency). As a result of the pressurized brewing process, the flavors and chemicals in a typical cup of espresso are very concentrated. Espresso is also the base for other drinks such as a caffè latte, cappuccino, caffè macchiato, cafe mocha, or caffè Americano. Espresso has more caffeine per unit volume than most coffee beverages, but because the usual serving size is much smaller, the total caffeine content is less than a mug of standard brewed coffee, contrary to a common belief. Although the actual caffeine content of any coffee drink varies by size, bean origin, roast method and other factors, the caffeine content of "typical" servings of espresso vs. drip brew are 120 to 170 mg vs. 150 to 200 mg.