A cup holder for a seat of an auditorium or theater includes a cup receiving body and a mounting arm. The cup receiving body is configured to receive and support a cup therein. The mounting arm extends from the cup receiving body and includes a receiving portion and an attachment portion. With the mounting arm extending across a side portion of a seat back frame of a single seat, and with the receiving portion receiving a front portion of the seat back frame and the mounting arm extending from the front portion of the seat back frame to a rear portion of the seat back frame, the attachment portion of the mounting arm abuts the rear portion of the seat back frame, and the attachment portion is attached at the seat back frame to secure the cup holder relative to the seat back frame.