Abstract: Methods and apparatus for a cup holder adapter according to various aspects of the present invention comprise a container comprising a substantially circular exterior surface and a multi-faceted interior surface. The exterior surface may be suitably configured to be positioned within a round cup holder device. The multi-faceted interior surface is suitably configured to receive a square, rectangular, or otherwise quadrilaterally shaped beverage container. The cup holder adapter may also comprise an upper section and a lower section such that the cup holder adapter may be positioned within round cup holders of various sizes while also being able to receive quadrilaterally shaped beverage containers of varying sizes.