A paint spray gun is a tool used to apply paint to surfaces, typically by atomizing and propelling paint particles through a nozzle onto the surface. It can be used to apply various types of paint, including latex, enamel, and lacquer, and is often preferred over brushes and rollers for larger surfaces, as it provides a more even, consistent coating and can save time and labor. Paint spray guns come in different types and sizes, with varying features such as adjustable spray patterns and fan widths, to accommodate different painting projects and preferences.

The paint spray gun is used for less delicate work, such as applying lacquers, paints, varnishes, shellac, and other finishes to manufactured articles. Paint spray guns are available as stationary equipment for painting automobiles, furniture, and appliances.