水塔是一种用于储水和配水的高耸结构建筑，常见于城市中。水塔一般被用来保持和调节给水管网中的水量和水压；主要由水柜、基础和连接两者的支筒或支架组成；用来在自来水系统中提供水的压力。

水塔有效容积： W=W1+W2：

像工厂、住宅区等地，就能见到水塔。另外，水塔还分成一般水塔跟冷却水塔。在大楼里，水塔有上、下之分。若是高达14层以上大楼还会有中继水塔。

A water tower is an elevated structure supporting a water tank constructed at a height sufficient to pressurize a water supply system for the distribution of potable water, and to provide emergency storage in case the town runs out of water. In some places, the term standpipe is used interchangeably to refer to a water tower, especially one with tall and narrow proportions. Water towers often operate in conjunction with underground or surface service reservoirs, which store treated water close to where it will be used. Other types of water towers may only store raw (non-potable) water for fire protection or industrial purposes, and may not necessarily be connected to a public water supply.