Abstract: A vehicle portable-office organizer (10) designed to be detachably mounted to the passenger seat of a vehicle. The organizer (10) consists of a tray (12) sized to accept a tray insert (14) that can be divided into a selectable quantity of smaller trays by dividers selected from a divider set (16). On the front of the tray (12) is attached a cradle (18) that allows a briefcase to be stowed during travel. On the back of the tray (12) there is a seat slip-plate (20) that retains the organizer in place. On the back section of the tray insert (14) is located an extended vertical container (24). This container may be designed with two compartments or a plurality of dividers that allow several forms to be easily stowed and retrieved. A cover/writing table (26) is also included that when placed on top of the tray serves as a cover or as a writing surface. When the table is not in use, it is inserted into a longitudinal slot (12g) for storage below the tray.