齿轮泵（英语：gear pump, gear pumps, gear wheel pump）是机器润滑、供油或其它液体系统中的一个部件，液压泵的一种。属旋转式。齿轮箱内有2个或2个以上的齿轮啮合，在旋转作用下从一侧吸入流体再向另一侧排出。其振动及噪声比螺杆泵稍大，可作为螺杆泵代用型式。其作用是使油或其它流体介质具一定的压力和流量及流向。

齿轮泵最基本形式就是两个尺寸相同的齿轮在一个紧密配合的壳体内相互啮合旋转，这个壳体的内部类似“8”字形，两个齿轮装在里面，齿轮的外径及两侧与壳体紧密配合。来自于挤出机的物料在吸入口进入两个齿轮中间，并充满这一空间，随着齿的旋转沿壳体运动，最后在两齿啮合时排出。

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications.

Gear pumps are also widely used in chemical installations to pump high viscosity fluids. There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gears (internal spur gear teeth face inwards, see below). Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.