埃桂语是印欧语系意大利语族的一个分支，与翁布里亚语有紧密联系。

埃桂语是意大利中东部靠近罗马的阿尔巴山的古老语言，公元前五世纪埃桂人生活在这个地区，但是在公元前304年的第二次萨姆奈特战争后，埃桂人被罗马人征服，埃桂语拉丁化，成为拉丁语的一种方言。很少有埃桂语的古籍流传下来。

Aequian is an extinct language presumed spoken by the people the Romans termed Aequi and Aequicoli living in the Alban hills of northeast Latium and the central Apennines east of them during the early and middle Roman Republic; that is, approximately from the 5th to the 3rd century BC, when they were defeated by the armies of Rome and were subsequently Romanized. As the area was heavily colonized by Latin speakers from Rome, most of the inscriptions from there are in Latin. Two undated inscriptions appear to be in a different dialect, termed Aequian by the scholars with the presumption that in fact they represent the language of the entire pre-Roman tribe. Not enough text survives to deduce any more than that it belonged to the Italic branch of the Indo-European language family.