Abstract: A demountable ladder tray support is disclosed which allows a tray for holding tools, paint brushes, paint and the like to be carried adjacent to the side rail of a ladder at any height desired by the user. The ladder tray support is mounted by means of a pair of clamping plates which are adjustable to accommodate mounting on ladder side rails of all dimensions. Pivotal mounting of a tray support bracket ensures that an attached tray may be leveled regardless of the attitude of the ladder side rail.