Sergey Dementev (Uzbek: ?????? ?????????; born 1 June 1990) is an Uzbekistani athlete specialising in the shot put.
He won a bronze medal at the 2017 Islamic Solidarity Games. His personal bests in the event are 19.37 metres outdoors (Almaty 2015) and 18.95 metres indoors (Tashkent 2017).