Abstract: A tape cassette holder includes a first panel and a second panel extending integrally and orthogonally from one edge of the first panel. A plurality of L-shaped dividers is disposed perpendicular to both of the panels, and is spaced laterally and secured thereto to define a plurality of slot openings therebetween. Each divider member includes a flange extending laterally therefrom, each pair of adjacent flanges defining a narrow portion of the respective slot opening which is adapted to engage and retain a portion of a tape cassette. A mounting plate includes means for joining the plate permanently to a surface, and also includes a plurality of mounting slot openings therein. The first panel includes a like plurality of T-shaped mounting studs which are disposed to be releasably secured in the slot openings of the mounting plate.