動量保存法則（粵拼：dung6 loeng6 bou2 cyun4 faat3 zak1，英文：Conservation of momentum）又嗌動量守恆定律（粵拼：dung6 loeng6 sau2 hang4 ding6 leot6），表明咗如果物體受到嘅外力係零，噉呢個物體嘅系統入面嘅動量同向量都會保持唔變，系統質心維持原本嘅運動狀態[1]。而根據牛頓第三定律，動量唔可以憑空噉變出嚟或者消滅咗佢，只能夠將佢哋傳遞去第啲嘢度。
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