姚定國(?—?),五胡十六國時期北涼大臣。

姚定國在涼王沮渠牧犍屬下任左丞相。439年八月,沮渠牧犍聽說北魏大軍前來,大驚。姚定國獻計,不出城迎接北魏大軍,卻柔然汗國請求救兵。沮渠牧犍派他的弟弟征南大將軍沮渠董來統兵一萬,在城南迎戰北魏軍,涼軍崩潰。九月,沮渠牧犍的侄兒沮渠萬年率部投降北魏。姑臧城被魏軍攻陷,沮渠牧犍雙手反綁,親自請降。

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