Erskine Rockcliffe Ronan (February 9, 1889 – June 25, 1937) was a Canadian professional ice hockey player who played 10 professional seasons from 1908 to 1919. Ronan played the majority of his professional career in the National Hockey Association (NHA) and played one season in its successor league, the National Hockey League (NHL) in 1918–19 as a member of the Ottawa Senators. He won the Stanley Cup in 1916 with the Montreal Canadiens. He was born in Ottawa, Ontario.