A shelf support comprising a member adapted for attachment to a wall or other structure said member defining a lipped internal channel of uniform dimensions throughout its length, and a shelf support bracket having a shelf supporting portion and a portion engageable in the lipped channel, and arranged to extend lengthwise thereof, the latter portion carrying a pair of wedges disposed within the channel, that portion being engageable between the wedges to hold the bracket against movement lengthwise of the member, said portion of the bracket being removable from such position between the wedges to allow the bracket, together with the wedges to be moved lengthwise of the member.