An oxygen delivery device for providing oxygen to a user through a retractable tube includes a first housing. An oxygen supplier, such as an oxygen concentrator, is positioned in the first housing. A reel, which is spring-loaded, is rotationally coupled to and positioned in the first housing. A door is positioned in and is hingedly coupled to the first housing proximate to the reel to allow access to the reel. A tube is coiledly positioned around the reel. The tube has a first end that is fluidically coupled to the oxygen supplier. The tube is positioned around the reel such that a second end of the tube is configured to be selectively and reversibly extended from the first housing through a hole that is positioned through the door. The second end of the tube is positioned to couple to an oxygen supply interface, such as a cannula.