大角羊（学名Ovis canadensis）是北美和西伯利亚地区的三种山地羊之一，另两种分别为白大角羊(Ovis dalli)和西伯利亚的雪山盘羊(Ovis nivicola)。目前的分类学家一般将大角羊分为以下三个亚种：

部分大角羊的种群处于濒危状态。

The bighorn sheep (Ovis canadensis) is a species of sheep native to North America named for its large horns. These horns can weigh up to 30 lb (14 kg), while the sheep themselves weigh up to 300 lb (140 kg). Recent genetic testing indicates three distinct subspecies of Ovis canadensis, one of which is endangered: O. c. sierrae. Sheep originally crossed to North America over the Bering land bridge from Siberia: the population in North America peaked in the millions, and the bighorn sheep entered into the mythology of Native Americans. By 1900, the population had crashed to several thousand, due to diseases introduced through European livestock and overhunting.