This disclosure relates to a nasal cannula without nostril prongs. The nasal cannula may be used together with an oxygen delivery system, such as a portable oxygen concentrator, or another type of breathing device such as a continuous positive airway pressure (CPAP) machine. In an example, a nasal cannula includes a tube configured to connect to an oxygen supply, and further includes a fitting configured to connect to the tube. The fitting includes at least one discharge port and does not include nostril prongs.