Abstract: One embodiment of the invention provides a beverage container holder that can be removably secured to a cylindrical support member. This embodiment comprises an open circular container attached to a clamp member. The clamp member has an open inner cylindrical bore surface opposite to its open circular container attachment. The open bore surface is forcible over a cylindrical support member of slightly larger diameter for support thereby. The open circular container is positionable by selective rotation of the open circular container relative to the clamp member and selective rotation of the clamp member relative to the cylindrical support member. In the second embodiment the open circular container is bottomless to enable a fishing pole or the like to pass through the open container. Spring or locking members may be positioned between the open circular container and clamp member connection to maintain the open circular holder in a selected position relative to the support member.