煤气鼓（英语：gasometer或gas-holder）是一个将煤气或天然气贮存在常温及标准大气压环境的大型密封容器。虽然煤气鼓能保存煤气或天然气，但现时煤气鼓的主要作用是稳定供气喉管在一个安全的气压范围内运作。一般一个大型煤气鼓的直径为60米，容量可达50,000立方米。

A gas holder, sometimes called a gasometer, is a large container in which natural gas or town gas is stored near atmospheric pressure at ambient temperatures. The volume of the container follows the quantity of stored gas, with pressure coming from the weight of a movable cap. Typical volumes for large gasholders are about 50,000 cubic metres, with 60 metre diameter structures. Gasholders tend to be used nowadays for balancing purposes (making sure gas pipes can be operated within a safe range of pressures) rather than for actually storing gas for later use.