A height-adjustable support for a display panel includes a base, a telescopic unit, an angle-adjustable member, a coupling unit, and a control member. The telescopic unit includes a hollow outer member and an inner slide member. The outer member extends upwardly from the base, and is provided with an upper limiting part disposed above the base, and an inwardly projecting lower limiting part disposed between the upper limiting part and the base. The slide member has a slide arm extending slidably into the outer member, and a top seat disposed above the outer member. The coupling unit couples the angle-adjustable member to the top seat. The control member extends into the outer member, is coupled to the slide member, and cooperates with the lower limiting part to prevent impact between the display panel and a support surface.