北部湾（越南语：Vịnh Bắc Bộ，英语：Beibu Gulf / Gulf of Tonkin），是垃拉南海西北部分沿陆封闭式海湾。
地理上东临琼、粤，北抵桂南，西到越南。总面积大约12.93万平方千米。
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