沸点升高（英语：Boiling-point elevation）指当一种组分加入时，某种液体（溶剂）的沸点升高的现象， 即一种溶液具有比纯溶剂更高的沸点。此现象发生于一种非挥发性的溶质（如盐）加入到一种纯溶剂（如水）时。 沸点可以用沸点测定器准确测量。

Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water. The boiling point can be measured accurately using an ebullioscope.