503國道也作國道503線、G503線、五通公路或五通線，是中華人民共和國國道之一，屬於一條國道聯絡線，始於黑龍江省哈爾濱市五常市與222國道相接，向西途徑榆樹市、扶餘市、松原市和乾安縣等地，於通榆縣與301省道相接。
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