A snow cannon (also called snowgun, snow maker, or fangun) is a device used to produce snow artificially. The product may be called artificial snow or man-made snow. A snow cannon works by nebulizing water and allowing it to freeze into snow. The device is often used by ski hills and ski resorts to supplement naturally occurring snow and extend the skiing season.

For the purposes of skiing, most enthusiasts consider man-made snow to be inferior to naturally occurring snow. This is due to the fact that man-made snow does not form snow flakes like natural snow; instead, man-made snow forms crystals that are more dense than natural snowflakes.

Snow cannon constructors have been following these aims:

• to maximize the amount of snow made,
• to extend the period in which snow can be made,
• to minimize the amount of energy needed,
• to minimize the impact on the environment.

Homemade snow cannons are gaining in popularity.