An ultraviolet (UV) sterilization lamp, a UV sterilization module, and an air conditioner including a UV sterilization module are provided. The UV sterilization lamp may include a lamp body having an outer diameter defined by an outer surface thereof, an inner diameter defining an internal space, and a length that extends at least in a lengthwise direction of the UV sterilization lamp； an emission material that fills the internal space so as to generate at least UV rays； and an external electrode provided on the outer surface of the lamp body so as to discharge the emission material. The inner diameter of the lamp body may be at least about 0.7 mm.
