俄瑞阿得斯（古希腊语：Ὀρειάδες，字面意思是“山之少女”）希腊神话中掌管山脉和岩洞的宁芙仙女（即山岳神女）。

根据神话，俄瑞阿得斯诸仙女是狩猎女神阿耳忒弥斯的侍女，陪同女神周游各地。关于她们的父亲，或说是大神赫耳墨斯，或说是达克堤利诸精灵，或说是萨堤洛斯诸林神。

俄瑞阿得斯的名字通常是按她们主管的山脉取的。如掌管伊得山（今土耳其卡兹山）的伊达厄斯，掌管喀泰戎山（今希腊基塞龙山）的喀泰戎尼得斯，掌管珀利翁山（今希腊皮利翁山）的珀利阿得斯等。最著名的俄瑞阿得斯是回声女神厄科（掌管赫利孔山，即今希腊埃利孔山）。

For the Hilda Doolittle poem, see Oread (poem). For the lake in Greece, see Lake Orestiada. For the city in Greece, see Orestiada. For the Dungeons and Dragons creature, see Fey (Dungeons & Dragons)#Oread.

In Greek mythology, an Oread /ˈɔːriˌæd/ or /ˈɔːri.əd/ (Ancient Greek: Ὀρεάδες, Oreades, from ὄρος, "mountain") or Orestiad /ɔːˈrɛstiˌæd/ or /ɔːˈrɛsti.əd/ (Όρεστιάδες, Orestiades) was a type of nymph that lived in mountains, valleys, and ravines. They differ from each other according to their dwelling: the Idaeae were from Mount Ida, Peliades from Mount Pelion, etc. They were associated with Artemis, since the goddess, when she went out hunting, preferred mountains and rocky precipices.