A refrigerator includes a universal shelf assembly that can be mounted in either a stationary configuration or a sliding configuration. The shelf assembly includes a shelf unit having a base portion surrounded by a peripheral frame. The peripheral frame includes front, rear and opposing side frame members that include a mounting boss and a locating tab. When mounted in the stationary configuration, the shelf unit is mounted directly to a support unit through the mounting boss and locating tab. Conversely, when mounted in the sliding configuration, the shelf unit is mounted indirectly to a support unit. Arranged between the support unit and the shelf unit are glide members. The glide members include structure that cooperates with the mounting boss and locating tab that both secure the shelf unit and enable the shelf unit to shift relative to the support unit.