Erskine Rockcliffe Ronan (February 9, 1889 – June 25, 1937) was a Canadian professional hockey player who played 10 professional seasons. 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 was a member of the 1916 Montreal Canadiens Stanley Cup championship team. He was born in Ottawa, Ontario.