The adjustable portable cup holder may comprise a top ring, a bottom ring, a plurality of intermediate rings, and an attachment band. The adjustable portable cup holder may be coupled to a mounting point and may be operable to hold a beverage container. The adjustable portable cup holder may collapse for storage and expand for use. The attachment band may adjust to fit the mounting point. As non-limiting examples, the beverage container may be a beverage cup, a water bottle, or a beverage can. As non-limiting examples, the mounting point may be a beach chair, a stroller, or a grocery cart.