A telescopically adjustable task tray for mobile elevated work platforms is disclosed. The task tray assembly may be used on most standard sized scissor and boom lift mobile elevated work platforms (MEWP's). It provides easy, fast (under one minute) installation, a convenient work surface, a contained space for placing tools and other items, an ideal surface for assembly, and primarily, an alternative to the old practice of working from the platform floor. The invention is not limited to use on mobile elevated work platforms. It could be used on industrial catwalks, mechanical chases, between two sawhorses, anywhere two horizontal bearing points are available within the telescopic range. The invention could also be modified yet still meet the original scope of the invention.