阿兰王国是位于北高加索的阿兰人国家。其地大概在北奥塞梯共和国，后被蒙古人在1239年摧毁。

阿兰是古代的奄蔡，他们被匈人打败后分为二支，一支去了欧洲，另一支留在高加索。他们先后成为可萨人与阿拉伯人臣民，他们后来创建西至黑海的阿兰王国，他们外交上重视与拜占廷、基辅罗斯结盟对抗钦察人。他们大概在十世纪时接受基督教。

王国时代高加索农业发达，堡垒密集，但蒙古人1239年消灭了王国。

Alania was a medieval kingdom of the Iranian Alans (proto-Ossetians) that flourished in the Northern Caucasus, roughly in the location of latter-day Circassia and modern North Ossetia–Alania, from the 8th or 9th century until its destruction by the Mongol invasion in 1238-39. Its capital was Maghas, and it controlled a vital trade route through the Darial Pass.