The backpack paint sprayer comprises a backpack, a spray gun, and a hose assembly. The backpack paint sprayer may be a portable spray-painting system. The backpack may carry a supply of paint which may be pumped from the backpack to the spray gun via the hose assembly. A turbine located within the spray gun may create an air stream that may atomize the paint and may disperse the paint over a surface being painted. The backpack may be adapted to be worn by a user and may enable the user to move about without being constrained by a paint supply hose coupled between the spray gun and a compressor.