Abstract: The window-based flag support is an improved flag support that secures to a window of a vehicle in order to support a small flag there from. The flag support has an elongated body so as to accommodate window sun visors located adjacent to said window. The flag support has an elongated body that extends well below traditional flag supports, and of which provides clearance to window sun visors. An alternative embodiment includes in adjustable flag support in which the distance spanning the clip and the base of the flag mast can be adjusted to accommodate differently-sized window sun visors.