电流表（英文：Ammeter）又称安培计，是测量电流的仪表，主要类型有转动线圈式电流表、转动铁片式电流表、热偶式电流表、热线式电流表以及钳形电流表等。

转动线圈式电流表（galvanometer）装有一分流器（shunt）以降低敏感度，它只能用于直流，但加一整流器（rectifier）也可用于交流。

An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. Early ammeters were laboratory instruments which relied on the Earth's magnetic field for operation. By the late 19th century, improved instruments were designed which could be mounted in any position and allowed accurate measurements in electric power systems.