The modular furniture system, particularly for offices, comprises at least one column-like upright element having a vertically elongate body and a plurality of fixtures which can be coupled selectively to the two ends and to the body of the upright to form a furniture arrangement. The vertical positions of the fixtures coupled to the body of tile upright can be adjusted continuously to achieve different heights for components such as work surfaces, shelves, suspended units, screens, lighting equipment and the like. The upright is self-supporting and permits multiple connection of fixtures which are independent of one another.