东非直角长角羚（学名：Oryx beisa），又名东非剑羚、直角剑羚或东非长角羚，是一种大羚羊。其下有两个亚种：分布在非洲之角及塔纳河北部沙地及半沙漠的指名亚种（O. b. beisa），并分布在塔纳河南部的肯雅及坦桑尼亚的长耳直角长角羚（O. b. callotis）。一些学者认为牠们是南非剑羚的亚种，不过牠们的基因却有明显不同之处。

东非直角长角羚肩高1米，重约175公斤。牠们的毛皮呈灰色，腹部白色，白色与灰色间有一道黑色斑纹分界，头部与颈部之间、沿鼻子、由眼睛至口及在前额也有黑色斑纹。牠们有一束细小的栗色鬃毛。角幼而直，雄羚及雌羚都有，一般长75-80厘米。

The East African oryx (Oryx beisa), also known as the beisa is a species of antelope from East Africa. It has two subspecies: the common beisa oryx (Oryx beisa beisa) found in steppe and semidesert throughout the Horn of Africa and north of the Tana River, and the fringe-eared oryx (Oryx beisa callotis) south of the Tana River in southern Kenya and parts of Tanzania. In the past, some taxonomists considered it a subspecies of the gemsbok (Oryx gazella), but they are genetically distinct; the diploid chromosome count is 56 for the beisa and 58 for the gemsbok. The species is listed as Near Threatened by the IUCN.