A hand-held cosmetic powder applicator brush apparatus for applying cosmetic powders such as facial powders and other powders to a user. The brush apparatus comprises a housing having a chamber for holding a powder to be dispensed and a valve mechanism for selectively opening and closing the chamber to a brush mounted on the housing so that powder in the housing may be dispensed to the bristles of the brush. The valve is operable by rotating an upper housing section such as a sleeve on the housing in a first direction to cause such opening. When the brush is not used, the upper housing section is rotated in the opposite direction to cause the valve mechanism to close. There is also a shield which extends around a portion of the brush to engage and protect the bristles when an outer cap is placed over the brush.