Sebastian John "Sibby" Nichols (August 10, 1884 – January 20, 1957) was a professional ice hockey player who played 110 games in various professional and amateur leagues, including the Eastern Canada Amateur Hockey Association and Pacific Coast Hockey Association. Amongst the teams he played with were the Montreal Shamrocks, Spokane Canaries, Seattle Metropolitans, Vancouver Millionaires, and Victoria Aristocrats. He also played lacrosse with the Vancouver Lacrosse Club.