沸點升高(英語:Boiling-point elevation)指當一種組分加入時,某種液體溶劑)的沸點升高的現象, 即一種溶液具有比純溶劑更高的沸點。此現象發生於一種難揮發性的溶質(如鹽)加入到一種純溶劑(如)時。溶液沸點升高的原因是溶液的蒸汽壓低於純溶劑的蒸氣壓。沸點可以用沸點測定器準確測量。

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