美洲豹（学名：Panthera onca），也叫美洲虎，是豹属动物，胎生，乃猫科中继虎和狮之后的第三大物种，同时亦为西半球最大型和最强健的猫科动物，外表型态的确和豹极为相似，但较粗壮，圆斑中有黑点，生态位也较像虎。是美洲地区唯一的豹属动物。现时美洲豹分布于墨西哥至中美洲大部分地区，南至巴拉圭及阿根廷北部。除了已被发现在亚利桑那州的美洲豹繁殖族群（在图森南部），美洲豹自1900年代初开始就已在美国消失（地区性绝种）。虽然如此，一些美洲豹的族群仍然很可能存在于美国一些未被观察的地区，包括南亚利桑那州、新墨西哥州甚至德克萨斯州。

The jaguar (Panthera onca) is a big cat, a feline in the Panthera genus, and is the only extant Panthera species native to the Americas. The jaguar is the third-largest feline after the tiger and the lion, and the largest in the Americas. The jaguar's present range extends from Southwestern United States and Mexico across much of Central America and south to Paraguay and northern Argentina. Apart from a known and possibly breeding population in Arizona (southeast of Tucson) and the bootheel of New Mexico, the cat has largely been extirpated from the United States since the early 20th century.