Various embodiments of respiratory patient interfaces that may be used to treat a variety of disorders involving upper airway obstruction, such as, without limitation, Obstructive sleep apnea (OSA), obstructive sleep hypopnea, and upper airway resistance syndrome (UARS). A number of the embodiments employ a nasal pillow assembly including a frame that supports a nasal pillow sleeve and a clip that is slid over a flange of the fame to couple the nasal pillow sleeve to the frame.