Abstract: A seat attachment for attachment to the side of a desk has a retractable support arm with a seat at one end that is movable between a stored position closely adjacent to the side of the desk and an outwardly extended deployed position to provide an auxiliary seating surface. In a first embodiment, the support arm is slidably received in a generally rectangular outer housing secured horizontally to the side of the desk, and is movable relative thereto between a stored position within the outer housing and an outwardly extended position disposed horizontally a distance above the surface of a floor. In a second embodiment, a support arm is pivotally connected to a generally rectangular outer housing secured vertically to the side of the desk, and is movable relative thereto between a stored position within the outer housing and an outwardly pivoted extended position disposed horizontally a distance above the surface of a floor.