奥斯塔公国(義大利語:Ducato di Aosta;法語:Duché d'Aoste),原为奥斯塔伯国,是11世纪至18世纪萨伏依王朝统治下的国家,现为意大利的一部分。“奥斯塔公爵”的头衔一直被授予萨伏依君主的的第二个儿子。
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