The invention relates to an optical fiber connector and to a related method for changing the polarity thereof. The connector comprises a ferrule, housing a plurality of terminations of optical fibers, and an inner housing arranged around the ferrule and comprising a rear portion and a front portion configured to be inserted into an optical fiber adapter. The front portion is releasably connected to the rear portion and comprises a frame, configured to surround an outer surface of the ferrule, and a key, extending from said frame along a longitudinal direction of the connector and configured to mate with a corresponding keyway provided in the optical fiber adapter, and The front portion is releasably connected to the rear portion by means of a first coupling member associated to the front portion cooperating with a second coupling member associated to the rear portion, in either one of a first orientation, in which the key extends along an upper wall of the inner housing, said first orientation corresponding to a first polarity of the connector with respect to the adapter, and a second orientation, in which the key extends along a lower wall of the inner housing, said second orientation corresponding to a second polarity of the connector with respect to the adapter.