A potato ricer is used to process food by forcing it through small holes, which are often not much larger than a grain of rice. Mashed potatoes are a food commonly made using this utensil. In technical terms, it works by a process of extrusion. A potato ricer can also be used to squeeze excess water from sliced or grated potatoes. This is useful to make crispy chips and hash browns.

At least three types exist. The simplest variety is little more than a grid on a handle. Food is processed against a flat surface or inside a container. Slightly more elaborate models resemble a very large garlic press. A rotary type, called a food mill also exists where the food is driven toward the grid by a large screw, similar to a meat grinder but without the rotary blade.

Potato ricers are used in the making of lefse (a Norwegian staple) and spätzle (German noodles), as well as for making homemade gnocchi (a type of Italian pasta).