电解质的电导率 (或 比电导)是表征电解质导电能力的物理量，国际单位制中单位为西门子每米(S/m)。

测量电解质的电导率是工业和环境监测中一种测定溶液离子含量的常规方法，并且这一方法快速、低廉和可靠。。比如可用于连续监测水净化系统的实时性能和变换。

很多情况下，电解质电导率与溶液中总溶解固体 (T.D.S.)直接相关。高品质去离子水的电导率约为5.5 μS/m，饮用水电导率处于5-50 mS/m范围内，而海水的电导率约为5 S/m (即海水电导率比去离子水的电导率高100万倍)。

传统上，电导率通过测量两电极之间的溶液的交流电阻来测定。稀溶液满足弗里德里希·科尔劳施发现的电导率对浓度的依赖性和离子可加性，拉斯·昂萨格对科尔劳施的实验定律给出了一个理论解释。

Conductometry is a measurement of electrolytic conductivity to monitor a progress of chemical reaction. Conductometry has notable application in analytical chemistry, where conductometric titration is a standard technique. In usual analytical chemistry practice, the term conductometry is used as a synonym of conductometric titration, while the term conductimetry is used to describe non-titrative applications. Conductometry is often applied to determine the total conductance of a solution or to analyze the end point of titrations that include ions.